You have so many really nice drawings! That makes it hard to choose which one to replace with a new one.
Maybe by looking at the number of views and comments related to how long it has been up can give you some clues?
This might be a candidate for replacement if you have a drawing that is a lot stronger to substitute in its place---- http://www.modelmayhem.com/portfolio/pic/25212275
Not that there is anything wrong with it, but some of your others are getting more comments.
yeah, you may be right....that's one that I wish I could have back, so to speak. The reference photos is fantastic, but I changed what she was wearing, and i shouldn't have.