Having a composition in mind is only one step towards painting a picture.
I know what I want to paint, and have an idea of the lay out. That is a good start.
Now I need to decide the mood. To visualize the possible moods, I think out loud, on paper. In this case looking at the subject in positive, a negative and neutral version.
The practice is done on gold toned watercolor paper with black and white for the positive and negative, with neutral colors for the other.
What I decided is …there are 3 paintings to do. Yep I like all three.
Next decision will be what actual colors will work. Sounds like I have more time to play with practice paintings before hitting the canvas.
How long does it take to paint a picture? Not long.
How much time does one spend thinking about painting that picture? A very long time.
That is ok, if you think with a paint brush.