I am wondering the very same thing. I had several rejected for lack of a reference image. I was about to go place them in the model release area and I'm glad I didn't and would have been shot down in flames yet again. They really don't give all that much information in the submit section while you are in there and then are SUPER technical about every little thing. I'm not giving up but am WAY over budget on any possible compensation that could be earned and it's all been from fumbling around as a newbie submitter. I understand where they are coming from and appreciate that they are protecting themselves as well as me but I wish it was a little more heads up somehow.