When values are close together a value study is more challenging than you might think. We have to do everything right to get a painting to go our way (even a painting exercise!) I give myself points for good values, but I take away a few points for some indecisive brushwork. My most successful efforts are those where I am "fully present" for the entire painting. Well, even when the outcome isn't 100% ideal, the things I learn during my self imposed exercises always help me on my next painting!
oil on 10x10 paper/foam core