The humor was ok in this. A bit dry, but ok.
The guy's eyes on the right were messed up. I think you made a mistake in the masking, but that should be a quick fix. Also, his mouth. I think it's the "E" sounding one. It is the color of the tooth on the inside. Maybe you forgot to fill it in white?
Ok, that's all I've got. You've got some things to fix.