Making progress on Alex in Pop Color

I have been working on Alex in Pop Color, although my hooking is a bit slower now that I am dealing with a torn up house.  I just finished the second face in the series of six that make up the center of the rug.  Each face is hooked with a different color plan.  The first one I hooked was done in the primary colors, red, yellow and blue.  The second face I did as a monochromatic study in purple (see photo below).  It demonstrates the importance of hooking by value instead of color.  Here is Alex's face, and it clearly is his face, but it is created by hooking particular values (lighter and darker wool in the same color) of purple (Jack Horner Plum #111) next to each other.  The lighter areas are prominent and the darker areas recede.