I think many of us have noted that the recent uploads section often includes seemingly endless sets of highly similar pictures from a photogrpaher or model. Too often the differences between shots are fractional and occasionally there are duplicates even. I find this a distraction and annoyance which spoils a quick browse of new work, making it a less enjoyable prospect.
Given that I'm convinced one the greatest skills of a good photographer is in curating their work, making sure only the best is shown (we all have off days) and also helping to keep the site experience interesting and dynamic, I propose an upload limit of 3 pictures per day.