Judging by the picture posted with obiwan from the movie, I think in this case its more a fact of obiwan was slightly transluscent in the face but very little, if you paint with opaque colors, you lose the whole effect and would end up with with zombie looking obiwan. In that fact alone I think this has to be cast in clear/tinted resin. I don't think this issue is a matter of accurate or not more than what is more practical for this rendition. Its all personal preference. I would take a clear one over opaque one but thats just me. if you want accurate, print it one an overhead projector sheet and project it on your wall.