that left leg looks perfect man. Except for the top of the thy (spelling?), theres a little value change there that indicates an elivation change in the muscle, that I dont think is there... But then again I dont have any anatomy book in front of me to look at so I cant be 100% on that. But dude, awesome work
The elevation change on the thigh is the rectus femoris. They are generally more visible on peoples with built muscles. I might have painted it in too dark making it seem more elevated than normal.
Thanks for the comments!