the head is far too big, hes leaning back too far, nobody walks like that unless theyre sneaking in a cartoon, the lower arm is way too fat, his hand doesnt even look vaguely like a hand, the torso is too long, the legs have no joints and the further forward leg doesnt look right where it connects to the body, by the looks of it he has no shoulder, the arm goes too thin nearest his shoulder, he has a wierd hunchback bit on his back, and id say the head still needs a little work, work on those draw out a rough skeleton for it first then flesh it out, come back when its done and well give you some more pointers, although what i said wasnt really a pointer but meh