Check out how this guy paints:
He is Russian which is too bad because I wish I could understand him.
Its fun watching him because he finds the form in the same way you would if you were doing a charcoal study. Very intuitive. He uses whatever tools he needs to (e.g. his fingers, paper towel, brushes). That kind of intuition takes a long time to learn and in my opinion can only be learned through lots of practice.