The best idea would be that all images uploaded in a day are placed in an image group and the first one uploaded is shown to the gallery and if you want to see more then open that group.  If someone has two different images then it will take two days to upload.  cuts down on the visual spam and allows all those render points to the uploader.

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13