May I suggest a 52-week challenge
Spend a lot of time per render per week and really make it special, one per day will eventually become redundant to a point where the post will be ignored
They are amazing and I think with a bit more attention and detail it would certainly be something I would look forward to every week
I suggest posting the new images directly only into new posts every day, and updating maybe only links to the images in the first post - as the post will (or has ;)) become too heavy to load, and it is also hard to keep track of what is new