Oh, I fortunately don't actually have to sell paintings to live, or anything. (I have a paying day job, haha!) It's just that most of my social circle happen to be professional artists (I wonder how that happened) so obviously I also have some standards as to the technique I want to have. Always wanted to have, actually. I mean, I got started by - very primitively - looking at other people's artwork, and thinking, okay, I also want to be able to do this. And then I started working on that... XD Also, I occasionally do illustrations that actually go into print, and I'd be very embarrassed indeed if the technical flaws were too obvious. (Actually, never mind: they'd never go into print in the first place...) So, yeah, even when sketching I can't really shrug that ambition off. (And, yeah, personality flaw - I know!)