Martin Sketchbook. Please critique!

[MW-Art]

Some gestures and faces. Really learned smth with the proportions there, even tho I dont get them right every time. I really feel like I learned a lot with those heads too, i was focusing on the structure of the head, not so much the features. I mirrored the heads and I found that I only had to do minor corrections. Im sure theyre still not right but theyre getting better hehe
The gestures are just random, mostly with ref, one from the amazing daarken, beacuse it was such a nice strong pose.