I just had a look at 3DTotal. I personally wouldn't post any of my renders there though, probably get laughed off

and I'd be asked to leave. :)

There's some excellent work on there.

I like criticism, it can help improve a persons work, as long as it's constructive.

I have seen a lot of people giving really good comments on every image uploaded by the same author.

Even though the images in my opinion were not that good. Could never understand it.

Although I've had a lot of nice comments for my work, I don't really comment on many myself.

I'm not a very good critic so I try not to. Sometimes it's better to be silent and be thought of as a fool, than speak out and remove all doubt. :)

Good luck Beelzebub.