Numba' three gangstas. Here's my notes:
Red: For the red I filled in a dark red so that I could get a better illusion of depth. I used a soft edge brush to create the side the light shone on.
Blue: I did the same thing with the blue.
White: Uh, I cheated and found out it was a white sphere. I thought I was going to be making a mirrored surface sphere, but was wrong.
Black: I cheated again. Black? Common! Ha ha.
Orange: The orange one threw me. I thought I had to draw the color that didn't have yellow or red. But then realised that yellow and red mixed created the color I needed.
Grey: I cheated and used Texahol to figure out what to do on this step. :/ Grey of coarse!
Sky Blue: I love cyan color and knew right away how to achieve this. Put the slider in the cyan area and start out dark to light.