The actor has very deep eye
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The actor has very deep eye and would benefit from some light tweaks. Basically, it's WAY too flat and it's very unflattering.
The backlight is non-existant. Stronger backlight will help your key and make the guy stand out.
Light on right. Go up about 1 foot. Warm it up with some CTO 1/4.
Light on left. Move it much closer to the lens and lower the output by 1 to 2 stops. This will help his deep set eyes and sculpt it a bit.
As to your color grading, I like my own mix 1, but that's totally subjective.
As to the background, all thos converging lines into the actors head make his head look crazy big. Something with less perspective would be less horrifying to small furry animals. 😉