I think you'll find many people have been burned already. I know people who have left viable constructive comments and have been attacked because of it, not always by the artist but by their friends and followers. For that reason many do not bother. Personally, if I see an image that I spot what I think maybe a flaw or error, I will IM the artist privately rather than posting a public comment and start with "I hope you won't be offended, but....." Most appreicate it and thank me - but I have had some nasty retorts ... the usual - if you haven't got anything good to say about my work then shut up. Not all, but many who post their work here are only looking for a pat on teh back, not helpful comments :-(

Gill