You'll notice here there was quite a shift from the initial sketch to the final art. The client wanted a more aggressive stance and hunched back to bring out the beastly quality in the character. Fortunately, I was able to make the necessary changes in photoshop by simply moving and tilting a few things around.
Also, the description called for the character to have a steam golem torso, which ended up looking just like a breastplate, so they asked me to add in the arm as well, to make the artificial anatomy more obvious.