Still figuring out anatomy.
Would love some critique before I continue.
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I think you’re really nailing it - love these kind of studies.
The only thing that jumps out at me is the sharpness of his abdominal region as compared to the rest of the more subtle musculature. However, there are many versions of this sculpt, so it’s up to you to really chisel on those forms or simply suggest them under the fatty flesh.
Love it. 
Yeah definitely smooth out those abs. When sculpting muscles it’s important to remember that there’s skin on top of them.