Many things need to be fixed with the Pictomancer.
When entering an instance, the paintings should be done.
When out of combat, clicking on a painting should paint them all; this shouldn't be difficult to implement.
Additionally, since it's impossible to use White Miracle when using 50 subtractive palette gauge and you're forced to use Black Comet,
they should standardize the button so that White Miracle becomes Black Comet when you have one stack or more.
Anyway, they are unusable as long as you have the comet.