ngl, that first drawing is truly superiour in all ways to him "drawing for himself". So I guess the moral of the story is "you are only good at art if you draw following the trends, and really bad if you don't". Or I suppose it could simply be "an artist can produce good work when they have a healthy mindset, but is trash if they are stressed out" instead.
Also, that "instagram models has really bad taste in art and prefers messy drawings", I suppose. Since she liked the second picture more.
The third image was somewhere in-between, and really was not saying the thing she read out of it (or anything at all, really).
ps: the last panel suggests they remain together. So for some reason he didn't report her, and instead accepted a really toxic relationship simply because she was hot. Reminds me of something Barney from HIMYM said once.
While modernist art got a justly earned bad rap when various Spook agencies and Communists decided to produce and celebrate the worship of absolute ugliness and skill-less pieces of work (they literally said their goal was to destroy beauty and make political statements against "bourgeois" and "past" values), there is something when a technically perfect artist wants to express something and try something unique.
The development of photography meant hyper-realism and photo-realism were no longer expressions of unique ability. A machine could, in fact, do it better. Photography really spurred on the rebirth of impressionism and a lot of some of the finest works of the 19th, 20 and 21st-century, where artists used everything from mildly cartoonish pieces, dreamscapes, blurs, etc., to create fantastic, impressive and emotionally resonant pieces that a camera couldn't capture.
From that perspective, while a guy could make technically perfect art that is beautiful and takes immense ability to create, a piece that is less technically perfect but has more imagination and vision could be just as powerful or resonant. It's not really an either-or, but rather contextual. This artist needed this as he needed to free himself from an ironic limitation. It wasn't like he went "full Slaanesh" though, where he is just smearing shit-jizz on a wall and calling it "The Ecstacy of Knowledge".
As for the "toxic relationship", while this girl is imaginary (because almost no woman would ever love you or care about you enough to provide for you for several weeks, rigourously maintain her body, and risk prison time for imprisonment, all just to help you become better. Seriously, any girl pulling a knife on you is one you're probably providing for and she is just jealously thinking you're going to leave her for another woman) , she fits the muse archetype perfectly, and each person needs a different kind of motivation. Some motivation is sweet. Other motivation is cruel. He needed a kind teacher when he was young, and when he was older, he needed a woman who was both kind (she gave him praise and everything he needed), but also the kind of overwhelming power and madness to compel him to complete his task. A deliberate insanity to guide his insanity.
An artist could do much, much worse than ending up with a wealthy patron for a lover who also is manic-muse driven to see you achieve perfection and variation in talent.