It is the largest and most time consuming (digital) piece I've ever done, about 45 days. Due to advertising needs, I had to do the image in layers, each character, environmental element, and effect had to be on a separate layer. It also had to read as four separate panels, integrated into a single wide horizontal foldable format. In the end it was around 20 layers (and I painted on the wrong layer at least a dozen times throughout the process).
They liked thumbnail #1, and we collectively decided to flip the image so it read from left to right. I also wanted to increase the size of the dragon so it's wings spread across all four panels.
A number of elements were revised, mostly the Kobolds surrounding the adventure party. I painted those changes in color instead of my usual grayscale to color method.