You have been rejected?
Ha ha, me too.
So what? My acceptance ratio is 56.9%. And I have no problem with that.
I improve myself all the time, and I am still working, and uploading more and better pictures, but... Don't forget about your rejected files. Take them and rework them. After that upload them again. They will be accepted at the end. I am doing like that. They will find what they need, and they will buy. BELIEVE ME. When I start to upload here, I was very messed up. My rejections were total. Now, my files are much better. But you have to improve your work. All the time. This is very important.
This article is for illustrators especially. I don't know how you can improve one photo, but if you have been rejected and you did it, you must be really good. This is what I think. I am not a photographer. I am still trying to learn photography. With illustrations I can manage.
Hope that helps. I wish you all luck.