This first image is the original photo for the painting "Summer Porch" (the source of my Sisyphean scraping efforts). In my infinite wisdom, I decided that a view of the ocean would be more appealing, so I removed the trees and put in water. I couldn't understand why I was having such difficulty with the perspective of the porch lines. Even after I thought I corrected it, it was was still wrong.
Finally, I realized, that in removing the trees I had arbitrarily created a new horizon line and a vanishing point that would not jibe with the receding porch lines. Such a stupid mistake on my part. If I raised the water line to correspond with the porch perspective, it would have looked like a straight-edged tsunami. So I brought back the trees, which then altered the colors of the columns.