I think there is a real difference between constructive criticism aimed at improving a graphic that you think could be made better, and attacking an artist for not doing what you want them to do. I think it is important to allow for the fact that different people have different styles and different preferences. If all my characters have purple hair...get a clue. I like purple hair. Telling me you hate purple hair isn't going to get me to change the hair to green. But if you give me information about a particular picture where an element could be changed to help, that's different. One person told me that they noticed all my lighting came from above and asked (ASKED....NOT TOLD) if I had tried side lighting to make a more mysterious look. Well, I tried it the next time and I liked it. Good advice given politely as an inquiry was something I could receive. If the same person had told me, "Your lighting sucks," I'd have hit delete and gone on my merry, top lighting way. People will not change until they are ready to change and the more you beat them up, the more resistent to change they become. Be supportive and constructive, and they may be more open to listening to you. And I guarantee every artist and non-artist here has someone who likes their work and someone who hates it. And that's just part of being creative.