I've just finished working on the sinewave project and frankly I'm sick of looking at it, I don't even know what looks nice or not, sure I can spot if the lighting is not quite right or if textures don't look like they are supposed to but I have a feeling deep inside that if looking at the project didn't make me sick I would have done a better job.
Sometime to avoid this I usually leave the project for about two days, but this doesn't work when there is a deadline and I'm stuck hating my work