>> lately I have been ignoring that, I am mentally challenging myself to picture the anatomy but I guess an amateur like me isn't capable of doing that yet.
Dude, everyone has room to improve, always. It's not cheating to study anatomy, and you won't get better quicker by not looking at reference material for the human body. Shit, I got a degree in art, slacked off for a few years, and now I'm re-learning a bunch of stuff all over again. Learning is a continuous process, and suggesting you look at the reference thread wasn't meant as a put-down. It was common sense. Any artist who cares about realism will spend hour upon hour studying the human body.