Some great stuff here Robat-- keep on posting.
You can never go wrong with anatomy studies, so keep popping those out. What are you using as reference for these? Both direct anatomical refs and drawn instruction are important-- for the latter Loomis, Bridgeman and Hogarth are all great illustrators with extensive instructional books, in case you're not already familiar with them.
For the Maori Warrior, it's very rare for someone of that girth and proportion to be just lean muscle-- typically you're going to see a little more fat, so you wouldn't have quite as much definition in areas like the small of his back or around the pelvis. That's not always the case, so it's more your prerogative, but I thought I'd bring it up anyway.
You do have a couple of small anatomical issues though. For one, I think you've defined the pectoral muscles a little too sharply, particularly as they recede toward the sternum. Soften that curve just a bit, and you don't need quite as severe a space between the pecs and the abs-- there's this awkward space between them currently. A great example to look at is Bob Sapp
; he's a very
muscular guy but doesn't have perfect definition because of the nature of his size and proportion.
The hands and feet need a little tweaking. With the feet, the length is good but they could go a little wider I think (though that may just be my perspective as I have suuper wide feet). On the hands, they could stand to be a little bigger but more importantly they need to be thicker
. We're talkin about some beasty guy who fights for a living, and here he has these delicate fingers. I want to see big fat sausage fingers on this guy, like this
-- it's more reflective of his occupation.
Lastly, the definition around the shin is odd. Specifically, you're over-exaggerating the tibialis anterior or receding the tibia too much. The main bulge along the shin should curve into the knee, with some extra width on the outward side where the tibialis anterior lies. Right now the muscle is the most prominent part of the shin and you can't really see the bone at all. (ref)
For the face, it's a fun piece but for how much his face is straining you haven't quite sold it. The tendons along the neck should be more taught and pulling out more from the skin. Also, they should be plugging in closer to the jaw-- when flexed those tendons run just inside of the jawbone. And I think you could throw in a more severe bulging vein, particularly along the brow, as well as more creases overall in that area. These aren't the greatest resolution photos but you get the idea: (1) (2)
Nice work man.