immediacy
From my first painting class, I have struggled with including too much detail. I am incredibly detail-oriented person in every other aspect of my life; why should painting be any different? So if there are 17 petals on a flower, I want to paint each one. Of course, that's not how your eye actually sees a flower - you have to stare and count to discern each of those petals. Impressionists understood this principle. While I don't aspire to be a great painter, I want my work to represent what I feel in the moment rather than an exact replica of each detail.
Immediacy. That one word sums up my painting goals. What do you take in in a single moment? What is the least mark you can make to say "flower"? One of my art teachers led a series of lessons that helped me toward that end. We were given 20-15-10-5 minutes to paint a still life. Don't labor over it. Don't overthink. Just put down on the canvas what you can see in the moment. This is one of my favorites of that exercise.