I just thought that it would be quite helpful to share the first of what I hope to be a long series of pieces emphasizing with creative piece. One of the most basic aspects and perspective of growing, improving and advancing as an individual artist is to learn how to evaluate your own work, others in a way that it gives positive help.
Above all, avoid comments such as "Yeah, I like it." or "Awesome, man." but I think that it can't be avoided in any ways, but please, if your gonna do so, add it after your thoughts about the work to avoid spamming. Such comments do not in anyway contribute anything useful to the artist itself, hence the rule against one-line posts in some forums. Though, such comments can also raise spirits and isn't a bad thing to do when looking on the positive side.
Now, to the main part. So if such comments aren't helpful at all to anyone of us, what shall we do in order to be proud of ourselves that we've become a part of an improving artist? First of all, think about what it is you like about the piece, whether a design of any artwork, or any other creative effort/piece. Now, ask your self WHY you like the piece. You should be able to give a concrete and concise reason. Not just it's pretty or cool or magnificent but what is it about the thing that makes you think that. What did the artist do well? That goes into into the first part of the post in response to someones creative work!
After that, move on to the next part which is pointing out the things you don't like and what causes you to not to like it. Where could the artist have done better? Why do you think it could have been done better? How do you think it could have been better? But keep in your mind, that everything to say is purely your OPINION.
One last caution: you are commenting on a person's work. You are not commenting on the person himself/herself, and personal comments or insults are not appropriate, or permitted.
Old article from me. I actually wrote this when kreativeflow.net is still active, I'm a global mod there and it's quite dead now.