I feel my eyes look bigger and better when I'm hydrated well. Other than that there was some sort of thing where you place your hands like binoculars around your eyes or something.. I forget what it's called. Sorry.
I have the same eyes, and I squint most when I smile. I find that makeup is my friend. I like to wear eyeliner to bring out my eyes. Personally though, I agree with the blue anon. Our eyes are beautiful and I'm very happy with mine. Bigger doesn't always mean better, as I've seen some girls who just look bug-eyed because their eyes are so big. I think having a nice shape to your eyes is what really makes them pretty.