It's that time again - to showcase the talent and imagination shown by our Challenge hosts and entrants, we're once again running a 'Challenge of Challenges,' to find the Picture of the Year for 2013 (yes, it's a bit late, but we ran out of days before the holidays).

As always, we've been amazed by the range of images uploaded to our challenges over the course of the year, and we've whittled more than 1000 challenge winners down to a more manageable 25 - selected by the dpreview editorial team. We're also trying out a completely new voting interface for the first time, and we'd love your feedback

Click here to explore and vote for the best challenge-winning images of 2013