Critique is kind of important no matter what stage you're in
It's not easy to learn completely on your own, and it certainly helps to get an outside opinion
That being said, his sketches are better than mine. I can't really point out much wrong about them, besides the fact that in his latest piece of art (besides the placeholder) it looks like the person's face is a bit caved in at the bottom.
You don't think criticism is a good thing when you're starting out? Would you rather the new artist be stranded with no one offering advice for improvements?