Put the paint down and leave it alone
Most of you brought photos home from class, I believe.
Make an oversimplified study from your image, and then spend some time taking note of what needs to be included in a painting, and what can be left out. Actually write it down.
Now make a more refined version, working from general to specific. For this one, please don't correct anything. Let the mistakes remain, and take note of what caused them. Try a more efficient approach to the problem areas on practice paper, then make another painting. Keep it VERY simple.