Oh, bother. I missed the upvote time for this. Luckily, I can still tip you some !PIZZA instead.
This is amazing! And that you're just getting into digital (with a mouse, too) is impressive. Took me so long to get the hang of digital when I was used to having a pencil and brush in my hand. If you can, definitely make the investment of buying a drawing tablet. It makes a world of difference in what you can do in digital painting.