An advice for DT: I think this message is no longer accurate because of the new non-level-based pricing structure for subscription sales: "You already have several very similar images in your portfolio or approved within this batch. If approved, these files will compete against each other for downloads thus diluting your sales. Keep in mind we have a level-based pricing and royalty structure so having very similar content online will leave you with less revenue."
Why not? Because, at the very first time - months or years - is good for me to have two similar photos (big chances to be found). After that, I can remove the one with less downloads. This idea came to me after this "image not selected" message: "These images show a very high degree of similarity with other images in your portfolio. We have kept the best versions online and removed the ones without any downloads." Hope this will help. Peace and love DT!
Quoted Message: The level-based pricing structure is still active for credit sales, so the message is still accurate. "Having similar files for better chances to be found" usually translates to spam. :)
Having similar images, but all different in composition or in point of view (even just a little) is a way to give more choice to the customer, so a chance for Dreamstime that the customer does not go to see elsewhere for alternative images. I have worked as Art/Creative Director for more than 20 years and I know very well that a little difference in the point of view of an image or in the composition can make a huge difference when you are projecting a document to publish.
Nikon D610 - Nikon D300 - Sinar P3 and Hasselblad H2 with Sinarbacks