Out of the studio and back in the great outdoors! I've become lazy and used to painting from cropped images viewed on my computer screen. I really need to get out more often. This was really frustrating at first, and it wasn't the composition or cropping. It was mixing colors outdoors and getting them to match.
Also I forgot about the challenges of changing light. When I'd started, the roof was much much brighter than the sky, but by the time I finished, they had swapped values. I kinda wound up somewhere in between.