Monster lab

Hell, it's fantastic. Good separation of values and colors, believable lighting and falloff, love the atmospheric occlusion, and wonderful rendering all around. If I could tweak it in any way, I might revisit the apparent angle of the floor and turn the form of the monster's head just a bit more. Compositionally, you appear to make us want to look at whatever the monster is looking at behind itself - but you never quite go there. Despite being the highest point of contrast, the monster's positioning diminishes him. If your intention is to make us focus on the far background, consider dutching the camera to the right (as we would tilt our heads to do so). However, without something to guide the eye back to the monster, you run the risk of losing your viewer's focus. This is all nit-picking at this point, of course.