Love purple war-mouse
Elk makes a lot of good points, but it would require a re-do if you're up for that.
Shadows can appear very strong, almost black in bright, arid environments but reflected light is also very prominent. I would try moving your light source higher for more atmosphere and greater potential for interesting cast shadows and I agree with Corinthian Baby regarding rethinking your fur rendering to be less tube-like.
The metal and new composition look much better but could perhaps do with some additional simplified geography; canyons etc.