When using CGI it’s best practise not to zoom it to fill the frame, but with Snoke JJ just puts it right in the frame to pull us out of the suspension of disbelief.
Unless I missed something, we never see Snoke. We just see a holographic projection Kylo is speaking with.
But none of the holograms in the OT made the characters look like outdated CG cartoons…
I don’t see why he wasn’t portrayed by a real person.
Actually, he was portrayed by a real person. It was Andy Serkis via Motion Capture.
😉