How does iron artist work?

Iron artist is usually, from what I understand, when you sell a large amount of one thing all for one set price. For instance, you decide to draw 100 headshots all for $1. Then you try to draw all the headshots!

With mine, I opened 20 sketches all for $0.50 and filled all slots (actually got more slots than what I bargained for) and now I will be trying to complete them all ^V^

It's almost like a competition for yourself, or a contest, or something of the sort. A game.