I did a color study (bottom) on my kindle which took about 30 mins.

I have spent 2 hours on the top image. I know I would not be this far along if it were not for the color study. Looking at the colors I was able to better see what worked and what didn't, allowing me to tweak some colors to make it more harmonious. I am really happy with the way this painting is going and can't wait to finish it tomorrow.