Think you nailed the concept, maybe needs a more pronounced curvature of the legs, especially on the quadriceps. Keep it up it's gonna look great in color!
Indeed the leg are pretty thin. I struggled a bit before making the decision to follow the concept. Since it is the kind of stylized proportion we could find on cartoon like batman, and superman (the 90's). I stopped when I find it was nicely balanced. Here, the bake are nice and clean, it's time for color, before finishing the gun and start the jacket.
Damn he is super cool! I think that his lower arms are quite undefined and have very little shape to them, especially compared to his legs and the extreme shapes they have.
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Also, a video of the progress in is on the way.
It looks very clean. Keep going !
Could we have another view? From this view it looks like his legs are a bit tiny compared to his forearms.
There is more on my artstation: https://www.artstation.com/artist/tigerheart