Nice work so far. A couple of CnC posts on my part though.
I would remove all of your color data (tool>texture>colorize) and focus on the forum of the models you work on. The last thing I do is texture…if I even do at all, the color gets in the way of the sculpt. Bad color can ruin a sculpt, and a bad sculpt can run the texture. They both have to be working. Once you have the sculpt down to where it needs to be, then you can add the color to “help” the image.
The cloth that you have on his body right now is good…it just isn’t how a shirt would fold and fall on a person. Look at reference whenever you’re sculpting. Do you think the Masters just pull this stuff out of their heads? We all look at reference, even if you’ve done it a million times before, it never hurts to base it on real life…if that is what you’re going for. Anyway, put a loose shirt on and take some pictures, or get a friend to take pictures, or wear the shirt. Or just look online for images of people wearing the type of clothing you’re trying to emulate.
Watch the forms on his arms, right now his triceps are waaaayyy to big in the posed shot. You have to remember that muscles move, contract and expand. In the shot his triceps should be relaxed and his biceps should be flexing.
Anyway, keep at it, the only way to improve is to try, try again…rinse…repeat.
Great start though