Hi banksta
I dont use mudbox but zbrush but I think some of the problems will be the same, when you created UVs did you check them (did you put a checker board pattern on the UVs to see if there was any stretching). If like zbrush you should start of with a low poly mesh with may be some extra mesh where you are going to have high detail (skin porse). Post a shot if you have checked UVs..............dave