School girl with teal hair

I spent my Saturday night on this. I was unhappy with how the navy blue attempt came out. Using Ultramarine + Payne's Grey... maybe I should pre-mix the colors, because my layers are so sloppy.

I use CamScanner, and PhotoScan by Google to scan my images in. My Samsung Galaxy Note 4 has a good enough camera that I can trust it. However, fixing the colors brings out all the artifacts. But all of the lights in my house have a biased yellow glow to them (except for the back of the basement and the bathroom, but who wants to scan their art in those rooms!)