One interesting thing with painting is that the more you add to the piece in a short amount of time, the more satisfied you will be with it. But if you havent made any major changes to the piece in about 10 minutes, you will slowly start to get sick of it.

For example in this daily I was so unsatisfied with the creature at one point that I was seriously thinking of starting over, however then I rushedly added the arms in a minute or two and suddenly it became ready to upload.