Your measuring exercises are really good!! I'm at term 5 and still struggle with that hahah I finish up always with overlapping my drawing on the actual reference and it's always off ahaha
Also the proportion one are really good!! Just one thing that I noticed is with the male's lower leg: try to make them a bit thinner maybe (now they're as wide as the upper leg ) but no problem easy fix. And remember that the inner part of the calf is always lower than the extern part, but don't worry you will tackle later