Looks very nice, a point of critique:
The blood on the bases is too red. Allthough it has a cartoony look, it would look better if darker. Some (or more) black or brown added would make it look less like a drop of red paint that fell on the base
The only thing pulling these mini's down a bit are the bases IMO. I would have done something different than sand. You could make them more interesting by adding some dead plants, or desert grass.
The metallics look ok. The arm looks good, nicely weathered. But I think the chest area looks a bit messy.
The skintones look good on both minis and so does the necrosurgeons robe.
Good job
