Heh, I can spot a lot more errors than that, but it's not meant to be a finished 'piece' just a sketch of an idea. The manliness of the face was intentional. I've learned it's never a good idea to criticize anything that could easily just be deliberate artistic decisions, just the technical stuff)
Most of this is just done from imagination, and as you know the main problem with 'sketching' the entire nude as a sculpt is the amount of surface area you have to cover and therefore the number of things that can be slightly out of whack if you're not constantly super-observant.
I suppose the goal is to get to the point where you know the entire anatomy of the human body so well, you can sculpt the entire nude from memory with no errors while having a phone conversation.