I like your new work. If you want to draw it in illustrator, that would be another drawing, which is different from the traditional hand drawn on paper.
Vector diagram has the advantage, you can see its constituent objects.
How to learn Vector?
Maybe try to find close to your style illustration on IS site, you can buy it's eps or ai  file.
Then you have a good example can refer.

This November is also a good sales month for me during this year.

Congrats Cory!
非常酷！

It's a great job!
I think it's very helpful for vector artist.