One of my favorite short lessons from the Virtual Art Academy describes the change in color from the foreground to the background in a painting in DAYLIGHT conditions.
To work this out, take a small piece of canvas paper and divide it into four horizontal divisions. You can make the foreground (lower most) two divisions larger than the top (background) two divisions.
In the lowest quarter, paint a patch of saturated (straight from the tube) rainbow of colors. At the division line between the first and second quarter, write: "yellow stops".
In the second lowest quarter, place colors that contain NO YELLOW and are less saturated (more dull) so: dull violets and reds only (remember that the other colors contain yellow and yellow stops). At the division line between the second and third quarter, write: "red stops".
In the third quarter place only dull blues.
At the division line between the third and fourth division write: "blue stops" and in the small top remaining fourth quarter, place dull, light grey only. Stand back from your exercise paper and see how the hue changes describe distance.
Can you see how the lowest two quarters appear closer than the upper two quarters?
Mom, Wife, Former Pediatrician, One who LOVES color, creativity, paint, and lifelong learning.