Here's a quick lesson in colour theory. There are two types of each eye colour; one is a warm version, while the other is cool. If you have eyes with yellow, gold or brown flecks, your eyes are on the warm side. If your eyes have gray or black flecks, your eyes are generally cool. Warm shades of green suit warm eyes and cool shades of green suit cool eyes. Warm blue eyes and cool brown eyes can sometimes work both warm and cool shades.
If you have warm eyes, you would best suit green shades that have yellow, gold, copper or bronze in them. Here are a few examples...
Add black at the outer corner and sweep it through your crease for a more dramatic eye or line your upper and lower lash lines with black eye liner and smudge it out. Never (ever) combine your green shadow with green eyeliner.
Remember, less is more. You want to be the one with the beautiful eyes!