Havent done this in a long time, used to be a part of my daily routine as a multimedia student, wake up, take a look at a dozen artwork on irc channels and then provide feedback.
Anyways, I am no master in creating or visualizing anything, but having worked in the multimedia field for over 4 years now I think I have a bit of experience to at least tell you what's good looking & what's not.
To pop the cherry, I'll post one of my recent works for a book cover, feel free to criticize.
Topic is self moderated, will only delete troll posts.