I have to agree! Very impressive studies. Your digitals are vastly improving. Those detail studies are an interesting idea. never thought about doing that digitally.
Like you already said it's really easier to paint when you have your proportions down correctly. I spend as much time as I can discipline myself to do on the drawing but then it's really quick working because I don't have to correct so much.
Those bridgman studies look so damn good!! Makes me want to reference you rather than the original.