Hrad crits? tough one, but I say push yourself more in the areas you know you are weak in. Also not so easy to crit studies and you seem to point out your own mistakes (maybe attempt to fix them?)
anyways your stuff is purdy...so purdy!
haha dude, all these notes around your drawings are fucking hillarious
Love the anatomystudies. Your portraits, however,are lacking structure. maybe you should get into skull/face anatomy as well to get a better feeling for what's actually going on in these faces concerning planes and stuff
On the other hand it might "just" be a matter of rendering, sometimes your strokes are a bit too rough to show all the subtle changes of planes, making it really hard to get a nice three-dimensonal feel.