Okay, guess it's time to post my struggles

I'm trying to get the general idea right for now, not going into details too much.
I'm building upon Loomis' framework, references from posemaniacs or photos





The waist and pelvis areas are most problematic for me I guess, tried to substitute the pelvis discs with just a block and I think it worked better in some of the drawings, but I think I should try to use the discs either way, since their idea is closer to actual skeleton.
Anatomy aside, I still can't get a good feel of 3d forms in general - when drawing simple 3d primitives I still end up with distortion and crooked angles, and any attempts at foreshortening without any reference end up in total failures

Any advice on this?