Does constructive critic really works?

[Rognoll]

I agree with Vandall, but I think there are ways to critizise. One thing is saying something like "his nose looks weird, you should check the nostrils again" And a different thing is saying stuff like "lol, he looks like he's smelling a fart" Both give you the same gems of knowledge, only one of them is covered in unnecesary rocky douchebaggery.
While I think negative critics are vital for one's improvement (actually, I think one gets to a point where it's impossible to keep improving without it), I can only say two things:
-Don't get offended, try to be objective about the critic. (like Eduardo said)
-Don't be an asshole yourself while giving critics.