I was able to separate the drawing from its background, but I couldn't do it the same way Cat did in the video. The magic wand tool couldn't pick up my gray and black cat. If anyone could tell me if it was because the painting is too light for the magic wand to pick up pixels or maybe because this was a photo I took from my phone's camera and not a scanned image and that's why I was having trouble...
Anyways, I was able to do this by using the lasso tool, then mask it, and remove the edges with the paintbrush tool.
I did the pattern!
I played with colorization.
This was a great class to explore on how to edit drawings that can be later used on for merchandise :)