I am not and never have been interested in realism or realistic styles. But I pretty much only draw like the photos i added(first two low effort with no shading, second two, slightly higher effort with proper-ish shading and some sort of background). Partially thanks to it being the style I prefer but mostly because I almost solely draw my Waifu(the character pictured) and he's a cookie and thus has no fingers, nose, feet, and his head is huge. 

But I worry that because of this my art looks weak and amateurish. I suck at realism and have no intent to even try to create any sort of realism, but I feel like unless I humanize my art I'll always be seen as a lesser artist.

And again, he's a cookie. There's hardly any rendering because he's 90% cookie and frosting. Proper fabric or skin shading would be incorrect to his very existence.

So should I keep drawing the way I currently do(canon accurate for the only characters I draw) and just try to imrpove shading or should I focus more on improving my ability to draw humans and start doing rendering?

A lot of people in the cookie game's fandom draw the cookies as humanoids or fully human so it doesn't really matter if they're canon accurate, but again, he's my waifu so I'm not sure i want to change him much unless it will improve my art.

I'm worried non-human anatomy is stunting any improvement.