I definitely feel your pain. Last night I roughed out a sketch of Shun, based interestingly enough on your critique, which I decided was correct ("He looks 100% man!") and determined to push the envelope in terms of making him look girlier but still unmistakeably male. I had all the flesh on and was starting on the hair and headgear. But just now I realized that his head was too big!
There was nothing I could do but erase the head (including the face which I thought was not too bad) and try again. Two tries later and I think I finally have something in the ballpark. My sketches look like a war zone by inking time, if they ever get there.
In terms of a simplified skeleton, both the classic Jack Hamm book Drawing the Head and Figure
and the old standby How to Draw Comics the Marvel Way
have some good suggestions. I can tell that you're already thinking in terms of the body having a depth to it, so this should come relatively naturally once you find something that works for you.
I hope I'm not out of line leaving crits like this, I realize this is a Saint Seiya
forum and not an art forum.
Again I look forward to what you come up with.