/ic/ - Artwork/Critique

what's the best way to get better at drawing the body when you're almost getting out of the absolute beginner phase? Should I just take random softcore porn pics and try to do them as fast as i can? Should I study each limb under multiple angles? Should I spend lots of time refining and understanding my mistakes on one figure or should I speedgrind a shitton of figures and look back after?

I think my biggest problems atm are proportions and perspective mixed with how some parts of the abdomen and lower body interact with each other.