Yeah, feet suck to draw from this position. But still, I luvvers it. The musculature is really great - you definitely know where those lines go! Do you use some kind of anatomy guide for the muscle/joint curves?
It's a matter of feeling i guess, i dont use any guide except sometimes some photos or sketches i find, just to get inspired of postures... But keep in mind that i may use my eraser much more than my pencil, escpecially for such a sketch. So if it looks wrong i redraw it, and so on till i find the most correct lines. Thank you for your comments and for the !!