I have been following a blog of an artist that I have found to be full of juicy information. He has given permission to re- post his blog information. So here is one that I found very informative.
NOT PATIENT ENOUGH
WRONG PAINTING SURFACE
CARRYING TO MUCH STUFF WHILE PAINTING OUTDOORS
OVERLY COMPLICATED COLOR PALETTE
Cad Lemon Yellow
Cad Red Medium
Colors to use if you are having problems with values. This is a wonderful palette that will allow you to mix some color but will hold you back just enough to concentrate more on values. I do this in my classes all the time.