Your description reminds me of a questioned I asked you before but got no reply to yet: Will you be coloring in Sketchbook Pro from now on instead of Photoshop? Seems like you are having fun doing so and looks great.
I have watched a channel on youtube called Toon Box Studio and he, Paris, draws on sketchbook pro all the time. He says that the next installment of Sketcbhook will be awesome and that he will be done with PS all together once that comes out. Sounds like Sketchbook will get a major revamp in next version that will be viral with photoshop. Can't wait to see what it is Ever heard about it?
I've heard things about the next version of SBP but for me, it's just that I've used Photoshop longer than any program when it comes to color and a few other things. Though I am excited to see what's coming up in it next!