that turtle looks great to.
So there isn't much to critique on your male model.
his thumb padding on the palm of his had might but a bit big. take a look at your had and take a look at the fleshy padding where the thumb flows into, I think you have yours extended a but much. check out the image below for where I think it should be pulled back too

as for the face, to be picky about it... it feels like his ears are a but flat and to small in scale.. however the scale feeling off might just be from the length of his face as after looking at reference your ears do look proportional.
But otherwise it looks awesome... keep it up!