I am a bit dissatisfied with my drawing lately, I want to improve my use of "values" and composition. So I bought a book by Carl Purcell (your artist's brain, het artistieke brien), one of those book about drawing with the right side of your brain. I always thought that to be new age humbug, but I was wrong.
I am doing some of the exercises in the book (in my own way), and they really help understanding what I am doing. This painting should be considered to be one of those, an exercise in values.