Out in the brilliant sun I stood before my easel to make the three small 8x10 oil sketches of the bush, the shed, and the field behind the shed. I also made another black and white bush later in the day.
I have been reading the excellent book Painter's Guide to Color by Stephen Quiller. One idea that he proposes is to make black and white drawings of your subject, and then paint from the drawing, using a color schema, which will allow you to be more expressive and not tied to what's in front of you or a digital image. Of course, his book is all about color schemas, which make for better pictures.