Be in the moment! I believe that at some point spontaneity should be part of the tool kit you use, just like paint or a brush. Thinking too much blocks creativity.
Try music, silence, outdoor sounds, anything to STIFLE THINKING and any voice in your head. When you do you become purposeful, and effective.
You can BE IN THE MOMENT 100% by using your head to isolate the problem, then be open to solving that current simple problem that ultimately ends up solving the bigger one.
Isolate, analyze and affect (fix). You don’t have problems everywhere. Start with the ones that matter. As you isolate and address each small problem, you are fixing the overall painting.