I originally started painting it on Autodesk Sketchbook Mobile Express on my Android phone. It is an absolute pain to sketch with if you're without a stylus, which I do not have. Also, this the free version, so there is a three-layer limitation, so that also makes painting a challenge.
So, I've just decided to finish it on the computer! It's much easier. However, because of this, the coloring style will look totally different from the background. LOL. SBMX and GIMP work differently when it comes to painting, but I'm doing the best I can.. OuO