Honestly, if you got a helmet painted exactly like this one (?), it is likely approvable. The paint leaves a lot to desire for us old nit picky dudes, but at the end of the day, I'd deem it "Passable," with a D+/C- grade paint.
The issue with these "types," of venders is that they're just trying to finish these fast and push them out the door, so *your* helmet may not look as good (and likely will not) as the one pictured. My best advice for buying a finished helmet is just to watch the Cargo Hold here for a member selling an old helmet. It'll likely be more expensive than an Etsy helmet, but you'll get what you pay for!