Waiting for your comments and suggestions
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first off, Great start! Things to refine I would say are starting from the top. The neck, the jugular is too where the adams apple is is too shallow and wide, inflate that a bit. the rectus abdominus (the muscles that meet with the ribcage) are a little too pointed, you might want to round that off a bit. The latissimus dorsi (side muscles) only side the rib cage, not allthe way dowen to the obliques. The back looks good. The spinal bones should be softened at the top along with the spinous process, it wouldnt be that deep. and the latimus dorsi of the back and the obliques should be a smoother transition too. Thats all I have to say about that. The arm muscles and the elbows are really done well. The silhouette is pretty spot on too. I know you are going for muscular, but keep in mind that even if you are super muscular there is still fat and those places are softer over the muscle tissue. Keep up the good work, cant wait to see this progress 
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Waiting for your comments and suggestions
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Looking good. I would work on his upper torso a bit more, I’m not really feeling a rib cage in there at all.
test render
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i think the render looks like a bit too plastic, if it is mr sss material then, i suggest decrease epidermal radius, increase subdemal radius and unscatter amount 