Sample sketch from last year...a Value Study

I thought I'd share a sample sketch I did last year in preparation for a painting. I consider this a Value Study and I do these often before starting a painting. I like to do them with markers in three values of gray. I prefer the TomBow markers. I have a sketchbook that I uses for all of my value studies but I think I will now do them in my 'project sketchbook'. It would also be a good idea to add some notes about the painting I am planning.
This is just one idea for the sketchbook. I do plan to do more involved drawings. I can't wait to start!