I love Colors! 3D, it saved me a toooooon of money. I was gunna get a tablet and Paint Tool Sai, which is really expensive.
Colors! 3D has all the capabilities of this, plus 3D!
It has it's own community for sharing your art, but it's extremely basic.
If you don't wanna use the Gallery it has, you can always export it to an SD Card and put it on your computer, it just won't be 3D.
My username is Alxan if you have.
I just wish it had pen pressure and more options of texture and more layers. I use like 50+ but this only has 6.