As the person who originally posted the statement, I think it's the arched eyebrows and the clenched teeth mostly, as in it looks like a forced smile. At least, that's how it 'feels' to me. Realistic, yes (don't ditch it, Gabe) but forced. But then what do I know. I struggle with making V4's smile look right without showing any teeth, lol!

Awesome work, Gabe.