Every photographer has one. The image you can't quite let go of - the one you've printed and put on the wall, or the one still sitting in your camera roll that you return to again and again. It might capture a fleeting moment, a place that means everything to you, or something you couldn't have planned if you'd tried. Whatever it is, it's stayed with you for a reason.
This World Photography Day, we're inviting all RPS members to submit that photo.