I changed "Huckleberry" to "Clover". Huckleberry Fin is a bit to famous to share the name. Here is the process on a possible illustration direction.
The sketch has already been posted (see below). Here is the line drawing.
I scanned in the line drawing and painted digitally. Starting by blocking in the general colors. I knew I wanted it to be bright and fun. I kept thinking "Pinterest" colors.
After many many layers, I made the whole image grayscale to make sure my values were ok. The background could be a tad lighter.
And the final image.