only things I noticed which jumped out at me (I'm really busy so this is a quicky, sorry) were:2nd one - waist is waaay too small compared to the chest, although the general shape is right. breasts also look a tad misplaced and a bit "stuck on".
3rd one - this is nice. his fingers are a bit thin and weedy looking. possibly a bit long too. most of the pictures seem to have a good grasp of anatomy and things like folds in cloth, they just need a little more accuracy. that'll come with time, no doubt.
x_x
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sexy pants! hee hee!