DT is notorious for rejecting "similar" images, so you might be seeing that quite a bit. They won't take more than a couple of images from a set, which I think is a mistake because it limits the buyer's choices. I get rejections from all the sites, but never the same images from any particular batch, and never for the same reasons. So at the end of the day, all of the images from a particular batch are available somewhere on the web, which is one reason why I won't go exclusive anywhere. I've been at this for a while now, and I choose very carefully which images to upload, knowing that the inspectors will simply take what they like, and all of 'em have different criteria, likes, and dislikes, even among inspectors for any given site. They are very subjective, when (IMHO) they should limit themselves to technical quality. But that's just the way it is, and I don't see it changing any time soon.