Take the critique, but...

I read an early attack on the art, and I think it was unfair. I think that these critiques are opposing a perfectly normal style that isn't meant to be anatomically perfect.
Firstly, the wrist is absolutely anatomically correct. Hold out your arm and bend your wrist to the side and you'll find it's a perfectly natural pose. On a side note, this particular wrist pose is fairly popular in drawing because it's quite dynamic.
Secondly, whatever "problem" you have with the chest area seems to just be your style. I'm sure if you really wanted to make it perfectly correct, your fully capable.
Lastly, I think it's fairly obvious that the calf muscle in question is in use, which causes the muscle to flex.
All in all, very professional take on the character in your own style, and congrats on front page!