For sure!

1. I started by putting blue painter's tape around the areas I was going to paint (except the collar where the soot spirit is) to keep the lines clean.
2. For the back, I mixed a heavy-body white acrylic paint with fabric medium for a base coat
3. I promptly ran out of my nicer acrylic paints and bought some cheaper ones on Amazon - it takes a few more coats but the amount of colors in this set was really nice for mixing
4. I sketched lightly in pencil an outline for the back before I began painting. For some of the bigger sections of color, like the grey shading on Haku, Chihiro's hair, and the blue background, I mixed in some more fabric medium, but not for every paint I used.
5. Then I just kept painting! I didn't sketch anything under the pocket portion, but I did the base coat mixture. I used sharpies to decorate the writing on the card, and the rest is painted.
6. I painted the soot spirit without an base coat :-)

Oh, and since this was my first time working with denim I used tips from this site/blog, and I used some cheaper multipurpose camel hair brushes. I'd post a link, but I found them in the basement and have no idea how old they are or where the came from. The only quality brushes I have are for watercolor, and I would never use those to paint with acrylics.

Hope this helped/was interesting! Thanks for asking!