I keep coming back to that screaming sculpt trying to figure out what is off about it. It's the mouth. Too much of his gums showing.
Problem isn't so much the gums, but the lip color and more so, the shape to the opening of the lips. Right now, the opening of his mouth looks more like a dentist asked him to open wide for a checkup, there doesn't seem to be a tension and sharp ull to the corners where his upper and lower meet to suggest anger.
It's also too square shaped froma front on view, if you look at the CGI mode, the top lip espcially shows more anglling from the corner whe the lips meet to the top where the lip goes over the teeth.
Subtle things, but they really are what define an expression looking like one thing or another.
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