while this isnt a requirement, i would advise in learning or at least understanding how some code/scripting works as Equanim mentions. There are a lot of technical things a good UI artist needs to master, but by no means need to learn it right off the bat. Knowing and understanding how stuff works will enable you to make…
+1 for everything Stinger88 said. You'll want to stress graphic design, art, and animation. Having some programming knowledge (which you'd probably pick up anyway) is also incredibly valuable. I'm a UI guy and went toward the coding end. It's really easy to switch industries (if you have to) and finding a job has never…