color wheel & value scale
use 45 degree angle when shading your value scale
create this color wheel use the 3 primary colors only.
use 45 degree stroke with many layers to achieve the correct color.
print the drawing above on an 8.5 X11 sheet of paper.
render it to the best of your ability.
remember the following.....
work from light to dark
leave white space
use earth tones.