I meant to reply to this too, but somehow, haven't.

You can undoubtedly draw on the computer.
I do it all the time lately. (well, not since I started on steemit obviously)

but three options that you may, or may not have considered.

blender 3D animation but really easy to learn how to make simple things into complex still images.

inkscape Vector drawing, another incredibly easy to start making shit right out of the gate program.

and of course the gimp GIMP open source, GNU Image Manipulation Program.

great for everything related to image manipulation. Fixing up all those other things you do, and for photos too.
But also easy to use to make images from scratch, or from fragments of other images.
if you wanna know anything about it or them, hit me up

big hugs