Apply an eyelid primer. Dip your finger into the primer and apply a thin layer on your upper eyelid, below the crease. This primer will help your eyeshadow last longer, just like the other primer you applied. Allow the primer to absorb into your skin and sit for a minute or so before you apply the rest of your makeup.

2.Choose your colors. 

There are so many different color combinations you can do for fancy makeup. If you are going to a more formal event you may want to stick to browns and grays. If you are going to a fun event you may choose to use a shimmery eyeshadow. If you aren't sure what looks best on you, try out some different shades before your party. It is really your personal preference, but here are some guidelines for eyeshadow colors:[5]

For brown eyes: Because brown is a neutral color, you have a lot of options for your eyeshadow. You can go with coppers, purples, and blues. Really, brown eyes can get away with most colors, but usually darker shades look better.

For hazel eyes: Pastels and metallics look best for this eye color because they help make light brown eyes sparkle. Heavy shadows can hide the subtle green and gold in your eyes.

For blue eyes: Soft tones like coral and champagne often look best on blue eyes. Very dark, smoky looks can distract from your eye color, so sticking to the lighter shades will draw attention to your eyes without distracting from your eye color.

For green eyes: Because your eyes have so much color, you don't have to use many colors for your eyeshadow to make your eyes pop. Choose eyeshadows in shimmery browns or even a muted purple.
Using a color wheel to find your eye color's opposite is a great way to make sure your eyes stand out. For example, orange is blue's opposite, so eye shadows with orange tones will help blue eyes pop, etc.

3.Apply eyeshadow. 

Start by applying a light, neutral shade of eyeshadow to your upper eyelid, below the crease, and then blend it into the crease with an eyebrow brush. Then, apply a light, shimmery eyeshadow like cream or white to the inner corners of your eyes for an extra highlight. Then, blend a darker shade into the crease of your eye -- you want the color to be one or two shades darker than your eyelid color. Finally, add a dark color right above your crease and blend it into your crease with an eyeshadow brush.

For blue eyes, you might consider using a light champagne color for your eyelid, a peach, coral color for your crease, and a light brown, gold, or darker peach above your crease.[6]

For brown eyes, you have a lot of flexibility. Basically, choose a light color for your eyelids and go darker as you move your way up. Try to stay in the same shades, though (don't use a purple on your crease and a brown above your crease).

For hazel eyes, you can do a light smoky eye, by using a light, shimmery gray above the crease of your eye, or you can do a purple eye. Use a light color on your eyelid, move to a pale or pastel purple on your crease, and then apply a rich purple above your crease (don't go as dark as plum though).
For green eyes, go for a shimmery brown look. Choose a light champagne for your eyelid, fill in your crease with a golden or beige eyeshadow, and then use a shimmery bronze above your crease.
Make sure that your eyeshadow doesn't meet your eyebrow. You want your eyeshadow to end a little bit above the crease of your eye and not any higher.

To achieve a smokey eye look for events especially fancy, start with the lightest tone of eyeshadow in your inner eye (usually shiny whites, peaches, or very light browns), then move across the eye (towards the ears) with every shade getting progressively darker. For example, on a blue eye, you could start with a light white on the inner corners of your eyes, then cover most of your lid with a peach color shadow, and finally adding a darker peach/gold/bronze (or whichever darker color matches the shadows you've used) on the outer corners of your eyes, blending into the outer portion of your crease and around the edges of the outer eye.

4.Highlight your eyes with an eyeliner. 

You can use a liquid or pencil eyeliner on your eyelids. Draw a thin line of eyeliner on your top eyelid above your lash line, starting from the corner of your eye and moving to the end of your eyelid. For a more dramatic line, you can create a wing or cat eye with your eyeliner, drawing the line out past your eyelid half an inch or so.

When doing top eyeliner, it can be helpful to place a piece of tape next to your eye, so that your eyeliner has a nice boundary. Take a piece of scotch tape one inch long, and line it up with the outer edge of your lower eyelid. Place it at an angle so that extends away from your upper eyelid towards the end of your eyebrow.[7]

The color you choose for your eyeliner is up to you. Black is good for a fancy party, but if you have naturally light lashes, a light or dark brown may be better suited for you. You can also choose a fun color like a shimmery bronze or blue if you want to add some glitter to your eyes.

You can use eyeliner on your lower lash line as well, but this often makes people's eyes look smaller. Using eyeliner above your lash line and then accentuating your lower lash with eye shadow will make your eyes look bigger.

A thin slanted eyeshadow/eyebrow brush can be used to help smooth out any eyeliner bumps and perfect that fierce wing. Simply place a small bit of eyeliner onto the tip of the brush and carefully touch up any issues.

5.Apply eyeshadow under your eye.

 This is in place of your under eye eyeliner, or in addition to it. Use a medium shadow (not a white but not a dark gray.. something like a beige or brown) and apply a thin line of eyeshadow from the outer corner of your eye to the middle of your eye with a thin eyeshadow brush. Then, smudge and blend it in with your finger or with an eyeshadow brush.[8]

It is really your personal preference what you want to do under your eyes. Start by applying your upper eye makeup, and if you feel like you need something more than add under eye eyeliner or eyeshadow. If you like the way you look without something under your eye, then leave it at that. You could also choose a fun color for under your eye like a light blue or purple.

6.Apply mascara. 

For the final touches to your eye, choose a mascara suited for your hair color. Dip your mascara brush in your bottle (making sure you don't pump it as this can dry out the mascara) and start at the base of your top lashes, underneath them. Then, wiggle your mascara brush through your lashes. After you have applied one coat, apply one or two more coats until you have your desired color.[9]

Repeat this step on your lower lashes, but apply the mascara to the top of the lashes instead of underneath them.

If you have dark hair, use a black mascara. If you have light hair, try a dark brown or brown mascara. It will still look mostly black on your eyelashes, but won't make your lashes look spidery.
Before you apply your mascara you can use an eyelash curler to add definition to your eyelashes.