I've personally always liked just drawing the lower lip and forgetting about the upper lip completely or vice versa when those sphere faces, but that's me talking about regular drawings or some such. Don't know how it'd work in a 3-D space. No idea about the eyes though. Just... go with a generic look that'll fit Lights personality?

I'm kind of running out of stuff to draw, so if anyone wants a quickie drawing of their character, do tell. I'll see what I can do. I'm drawing sleeping Pokemon, I'm that bored right now. :D

EDIT: I forgot to mention. X-Files/Transformers crossover comic series exists. It is official. My mind hurts and keeps exploding, but I think I like it.