It usually has to do with relationships. What relationships, you ask?
How red might behaves next to green will be different than how it behaves next to, say for example, violet. How one value reads next to a darker value might be quite different in how it might read next to a more medium value. In other words, everything in every painting reads in the context in which it lies. If a triangle shape is the only triangle in a group of many circles, the triangle will seem way out of place, or will absolutely draw the eye due to its’ difference. (contrast!)
As I was painting this piece, the tops of the dark cypress (seen over the edge of the ridge and between the face of the big bluff) they drew the eye away from the focal point at the top left of the painting. Not good! So . . .how to fix it? It was merely a value relationship problem: the bluffs were lighter in value then . . .I had established a contrast that wasn’t consistent with the rest of the painting. Darken the cliff face . . .and keep the color contrasts at a minimum . . .was the solution.
Several difficulties like this arose all through this painting. The beach and the edges along the foam and sand were dangerously distracting the eye, also. Again, value differences and sharply defined edges (sudden value changes) pulled the eye away from what was important in the painting. The beach is meant as a quiet area to rest the eye, not attract it. The white of the foam had to be calmed, the edges blurred, the values brought closer were all slight but significant adjustments that were needed for all the different pieces in that area to relate and act as a whole, rather than individual parts.
Contrasts are what make a painting work, but building harmonies with them and setting up transitions and gradations between contrasts is a great challenge. It goes beyond painting “things” and “details.” As artists, our charge is to paint relationships.