There is a lot more detail in this than I think most people realize. Starting out looking at the piece, it appears to just be a full body portrait of a wounded guy wearing a helmet. Then you notice the wound is black, and his helmet is freely looking with an eye, and is they eye crying? Then, zooming on the picture reveals that the black wound is actually small people trying to escape his body. Could it be a metaphor for something? Looking a little lower, and then you notice the group of people watching this thing, giving a nice scale. Are those sludge people human sized then?
Honestly, I could look at this piece for a long time and still notice new things. You've done a great job with the amount of detail, and it all looks great. I couldn't come up with anything to improve on, so I'll just say this: good job. I'm glad to have found this today.