Sunday's plein air painting with two friends at lake Merced in SF. Well it's mostly plein air. It was getting late in the day and I couldn't stay out any longer to finish it. So...I took a photo to use as reference to work on it at home. I would say 75% of this color study was done on location mainly the middle and background. The other 25% percent I used a photo to paint in the silhouetted foreground of the branches and tighten up a few other shapes. This is the first time I have use a photo reference to finish a plein air painting. I must admit I feel somewhat guilty to do so.