The following are direct links to color charts I have created to allow you to more easily match the colors I create during my lessons:

Green Chart
http://www.timgagnon.com/wp-content/uploads/2014/01/greenchart.jpg

Sky Chart
http://www.timgagnon.com/wp-content/uploads/2014/01/skycolorchart.jpg

Skin Tones
http://www.timgagnon.com/making-the-color-palette-for-skin-tones-a-bit-easier/