My tools of the trade are quite similar to Tom's, but based more on the lettering side than illustration.
Here is my initial sketch. I only did one as I'm super busy at the moment and wanted to get this done in one afternoon.
I'm familiar with the pen tool in Illustrator but find it hard in Photoshop, so was good to push my skills in PS. Had fun playing with the textures and got quite messy. They definately work better than using stock textures.
Here is my final piece that I really happy with, due to how easy Tom made his class to follow.