Looks more like a finished illustration then a "Color study" to me^_^ Though, I really like how it turned out! How often do you set out and create color studies like these for your usual work? And what would constitute needing to do one? Just curious.
It's great to see this large and look at the fine details and how it's been structured. There's a confident awareness of where colours and tones belong in the build-up.
I adore this. sorry to gush but...wow!