I assume you mean a smoky eye look. In a nutshell, a smoky eye is one that is darker at the base of your upper lashline, and lighter in your crease. To explain this look, I will use a typical black and grey look to explain, but you can use any colour scheme, just use the same tones (dark or light).
1.) Use a primer. This is something like Urban Decay Primer Potion or Too Faced Shadow Insurance. NYX and L'Oreal have one too. Primers are used to keep your eyeshadow from creasing, something that is especially important with dark looks. Apply from the lash line all the way to the brow bone and under your eye.
2.) Use a dark base. You can just smudge something like an eyeliner all over your eyelid and blend it out well with your finger. This keeps the eyeshadow vibrant and gives it something more to stick to.
3.) Use a matte (no shimmer) brown only a little darker than your skin tone in the crease (the hollow of your eye above your lid) so that the colours blend seamlessly.
4.) Use the darkest (a black or charcoal) around your lashline, about halfway up your lid. As a basic rule, it should be thicker in the outer edge of your eye, and thinner nearer to the inner corner. Avoid dark colours in the inner corner of your eye.
5.) Take a midtoned colour (grey) and blend it on the upper part of the lid and into the crease, but don't let it go up very high. It shouldn't go higher than the brown colour used previously, but that colour should go pretty high anyway.
6.) Bring one or both eyeshadows on your lid on the lower lashline if you want. You don't have to do this, because it can be less flattering on some people.
7.) Use a very light, preferably shimmery, but not necessarily so, on your inner corner. Where the tearduct is. You can blend it a little bit into the inner lid/inner crease if it looks harsh.
8.) Use a matte colour a little lighter than your skin tone underneath your brown on the brow bone, and blend it down to fix any harsh lines. You can use it somewhat like an eraser.
9.) Important step. Take a dark liner, like black, and put in on the upper lashline. Before it sets, use a short stiff brush to blend/smudge it out. Once again, it should be thinner on the inner portion and thicker on the outer corner. You can blend this on the lower lashline too.
10.) You should but don't have to put a black eyeliner on your waterline. This is the flap of skin between your lower lashline and your eye. You can put it on your tightline, which is the top waterline, but it's a lot harder to do. Probably not worth it.
11.) Apply mascara.
Whew. Sorry I'm so longwinded. *Most important step*. Make sure to try this at home in private before you wear it to go out, because you will probably mess it up. Also, test out the steps above to see what looks best on your eyeshapes, skin colour, eye colour, and age. You can also look up videos on YouTube. There should really be a plethora of them. Hope this helps! Maybe too much!
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