I created my own Advent Calendar this year. Every day has got a different illustration of the actual date. For some of them, I created an easy animation too.
First I thought about how to illustrate the current number. I then scanned the traditional drawing in A4 format. After that, I edited every single work with Adobe Photoshop and prepared it for AfterEffects. I tried some different effects and afterward, I composite the whole thing with a piece of music from Adobe Stock.