What the others said =)
I have really round eyes, they look like two marbles on my face =.= and this is what I do:
Line your entire top eyelid, thinly near the inner corners and thicker near the outer corners, extending a bit beyond the outer corners or wing it if you like.
Line only the outer half of your bottom lashline, and really highlight the tear ducts.
Use individual fake lashes on your outer corner to make your eyes look even longer =)