I really liked the book: Drawing on the Right Side of the Brain. It tell you how to suspend your judgement and get into a state of flow while drawing. The same

I really liked the book: Drawing on the Right Side of the Brain. It tell you how to suspend your judgement and get into a state of flow while drawing. The same can techniques can be applied to painting. Also spend some on quality material, you don't need to have a lot, but make it quality materials that inspire you.