Oki, since it's scanned, why not crop and center in nicely on some more white background to give yourself room to work? There are a couple of things you might want to consider... one, kill the white background entirely, just wash it all in some tone, that skin orange would work. Two, don't work about the COLOR, think about the value, that it, how bright things are. Any color will work, but the value has got to be laid in to express your light source, which it isn't, since her globes are showing a light from the upper right, but her extended are is showing a light from the middle left.
your drawings are inspiring, it's great to see you drawing and study methods and tyechniques at the same time, that's what I need to be doing. any tips or words of inspiration on how you find you source you can give will be great
thanks for sharing.