If you have access to it, you should probably redo the clothes in Marvelous Designer as they're stretching and deforming in odd ways atm. The fire on the hooded characters fist should be trailing behind his fist as it moves forward (instead of just be going directly up). He should also have his upper body twisted a bit to show the weight being put into the fist. Both characters arms appear kind of distorted, and the the shirtless guys Brachialis muscle is way too pronounced and thin. The musculature around his ribs (Serratus Anterior) look to be too numerous and connected in odd ways.
There's more I could say, but I think that's enough to keep you busy for a while.
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There's more I could say, but I think that's enough to keep you busy for a while.