Another value study

Stupidly enough, I re-enabled the power-save feature on my display driver today, even though I knew there had to have been a reason I disabled it in the first place. Basically I get an apparent boost in contrast due to the display showing fewer shades while on battery. So after I got back on AC and uploaded the pic, I realized my values were kinda meh. Oh well, live and learn. Anyways, sketch (10 mins) and value study (another 20-30 mins):