i do not have that stuff XD do everything by hand, hahahaha. teach me to do it with 15 year old software sempai(also i really want to share my newest mer with you to see what you think, more aerial than yours but less cartoony)
Photoshop is at least 15 years old, it has layers. :P
I use Painttool SAI for most of my digital art shenanigans (although I did the water background in photoshop, because it's easier there). I believe it costs about $60, in JPY.
;3; yeah, no i like the software that came free with my computer from when i was a teen(and the software that bundled with my tablet though that company is well out of business now)
Paint.NET and GIMP are both free and pretty good for various things. I've never tried doing actual digital painting in either of them, but they should work. And have layers! :O