Make it brighter, the main color is hideous.
Make those yellow lines on the arms / legs pop out, and maybe add more of them around the set.
The lines on the glutes look misplaced and not well mapped at all, no reason for them. Same thing goes for the grey Diamond shaped things on the side of the hip and knees, they look jam packed in there and no real reason, and they aren't even aligned properly. The rest of the set is so dark these ugly brighter details stick out more
The way you made the forearm connect to the elbow joint looks great, you could definitely use that same technique to make the thighs / glutes and knees / shins / thighs come together