dang that first one is very Dave Rapoza, specifically the style he uses with Starveil and Steve Lichman. Very interesting. If you wanted to pursue that further, he uses very vivid colour to sort of offset the griminess of the lines.
Epic rendering on the faces too, nice.
The vampire troll (?) however seems a bit off to me, maybe because the rendering is sort of realistic while the character isn't? Though I've seen that done effectively before... There seems to be some structural issues with the chest, the left pectoral is tiny compared to the right and blends with the shoulder. That then makes the V of his shirt off-centre, accentuating the lop-sidedness. His wrist looks broken as well, I can see what you're going for with dynamic lines but in this case it breaks the expected form of an arm and just looks like his wrist turned to jelly, especially compared to the thick and solid one on the right. I appreciate the sketchy painting rendering style though, just the underlying structure letting it down.
Hope crit is alright, I know some people don't like it unsolicited 
