Much like others have said. It was fun for a while.
And to sum up others suggestions as well as what I've been thinking as I played straight into the future.
Surely some form of death variables could be decided. Debt having some sort of effect on you as well, as would stress and the natural span of your life.
Possible hunt down some picture and manipulate them to fit the condition of the artwork. So an unfinished picture would display an image of a picture missing features. Or a grotesque picture would be warped version of the original image. These are something you could probably get help from the rest of the NG community on.
In addition, maybe adding in more options.
That or a sort of free drawing mode where you can paint something there and submit it. Surely coming up with something to accurately evaluate the picture and it's appeal could prove problematic, but I'm sure you could dabble around. Just another suggestion to get your mind going.
Over all though, it was nicely executed, but lacked a sense of value and a means to an end.