Pretty good.
the thing I dontl ike though it the position of the chieftend's hand and the angly/length of the hammer, it just doesn't seem right to me, if you were ever to redo this pic, maybe have the burte be a liilt more relaxed, have the hamnmer at an angle, and maybe have the hammer a little longer. the hammer ( I think) is supposed to be a little taller then the brute.
The only thing I have ot say about the ODSt is maybe put a shadow on the wall he's hiding behind.