Clip Studio Paint EX is the program most of my work is done in, with Photoshop CS5 for things like puppet warp and resizing.
I have well over 2000 downloaded you'll need to be specific. I will try my best to get back to you with the one you're asking about. Assume all brushes have been tweaked to suit my own needs. Frequently used: G-Pen and Mapping Pen, Frenden's sketch and painting brushes, Devin Kurtz's foliage set, and a whole mishmash of prism and glitter brushes.
How long do your pieces usually take?
This can range from a few hours to 20+ spread over weeks. I don't really time my work to have a more accurate idea.