It would definitely be an advantage to quickly record important colors while painting in changing light. One way to accomplish this is to create small pieces of correct colors to use later in a color study, or a finished painting. Today, I gave everyone a daisy and a bachelor button. These two flowers have very different greens in their stems, This is an example of a color map created in class by a student.
This is a color study (painted on a piece of mat board with a coat of gesso) of the daisies and bachelor buttons in a red Solo cup by the same student.
Here is the final tiny 4 x 4 painting after the color map and color study by the same student. This student was my sister, the very talented Kate Church. If you click on her name, you will be directed to her web page where you can enjoy her fabulous work. What a treat to have her visit and paint with us!!
Looking at a collection of landscape paintings, I found that the paintings that were most interesting to me had a compelling area that seemed to emanate light, to "glow". I remember reading somewhere that in a painting, an area of glow seems to expand beyond its painted boundaries.
To discover how to achieve this in class, we each examined a painting with an area that glowed. We deliberately worked to reproduce the glow that we saw in our example.
Here is what seems to work. To achieve an area that glows, make an area of pure clean light color. Transition from this color with a color in line on the color wheel (e.g.. light pale yellow, follow with a light, pale yellow orange, then light red orange or starting with white, follow with light, pale yellow). Follow this with a middle value of a chromatic neutral. A "chromatic neutral" reads as a color's name (e.g. instead of grey, a chromatic neutral is a greyed "purple").
Here is a subtle example of the effect of a chromatic neutral green compared to a more "clean" intense green beside the area that we want to "glow". The less intense green on the left grape makes the glow more effective than the brighter green on the grape on the right.
Mom, Wife, Former Pediatrician, One who LOVES color, creativity, paint, and lifelong learning.