Hope this outline of the leg’s muscles will be usefull for you. The names of the muscles are in Spanish, I hope you know a little bit :D. I think these are the ones that an artist should take in mind.
Clik on the image to enlarge it.
This one from Killer Instinct. He is naked 😀 beause I did it with the excuse of practicing the human skeleton. Then, as you see, he doesn’t have the belt and the bracelets.