Like this idea

And have it where people could submit ideas for the challenges and acknowledge them as having been the one to suggest the challenge

Create a separate page in the gallery for Users to see all of the current challenges that users have created as well as having the option to post a new challenge on that page so you don’t have to scroll through every post or tag everyone to get the news of the challenge out there!

I think we need an avenue for Pigment-res to create challenges that are open to all Pigment users. If you could create a CHALLENGES page with specific criteria required: I.e., start/stop date, if there is a particular picture to color, colors to be used, and then display ALL the responses to the challenge. Once the challenge date is over all responses would be stored by date with the b/w starting page showing so people would no where to look at previous works.

To improve the social aspect of the app and interactions between artists, it would be nice to have a specific place to search or submit a line drawing as a challenge and be notified automatically when people try one of yours.