Hi Rayk, pretty good so far, I think you need darker values on the face though. slightly darker. Also how come you don't paint in the background values? even roughly?
There is so much improvement in your figures here that its great to see! What I would love to see now is for you to put a little bit more love into the faces. I see a lot of good construction and thought went into these, but just spending a little more time in really refining the faces will bring these characters to the next level.
Keep up the great work man! Also, I found something that might interest you.. well everyone really. I don't know if you have seen much of Sparth's recent work But he has this really great speed painting technique in which he uses allot of custom shapes. He outlines his process here: http://www.conceptart.org/forums/showthread.php?t=201403
A friend showed me this and I had a go of it and found that it was a great way to get interesting abstract shapes really quickly on the canvas. I'd love to see what a man with your skill would be able to create using this technique.