Another way of getting emotional paintings done, is to wear of the special emotional hats you find in CAS. These hats inspire a.o. angry, sad, playful, flirty etc. Wearing a hat lasts for 5-6 hours. You can start an emotional painting, put it in your inventory to finish later, prepare another canvas, put it in yur inventory, and so on. When you're ready, just resume painting these works by putting them back on your easel.