Just like skin tones, eyes come in all shapes and sizes and knowing how to use makeup to enhance your eye shape and size is one of the basics of makeupdom. I came across this photo of Jamie Lynn Sigler of Sopranos fame and loved the artistry on her deep set brown eyes.
As deep set eyes have a tendency to appear to recede, its important to use lighter colors to bring forward those peepers instead of dark colors. As a result, if you have deep set eyes, you'll want to avoid doing an all over black smoky eye, for example, because it will make your eyes look smaller.
Instead, do what Jamie's done:
1) Apply a light, shimmery eyeshadow to the eyelids, extending slightly above the crease. Here, Jamie uses a shimmery champagne color that deepens her brown eyes. Recs for shadows are: Bobbi Brown Metallic Eye Shadow in Champagne Quartz or Gold Dust, MAC Shadows in Nylon or Seedy Pearl or Retrospeck (a personal favorite!), Revlon Grab Me Gold Diamond Lust Shadow.
2) Avoid putting dark colors in the crease, in the traditional manner of eye makeup application. Dark colors in the crease will make your eyes appear to recede more.
3) If you want to smoke out those eyes, smoke near the lashes, not the lid and not the crease. Line the upper and lower lids with eyeliner and use a sponge tip to smudge the liner around the lash line - just avoid moving the color to far into the middle of the lid!!