The main problem isn't the looks of the hero. Let's be honest, how many "plain joe" heroes are there? Not many human-looking male heroes that didn't step off the cover of GQ
The problem with female heroes in comics is they usually fall into 2 categories: female companion to a male hero, or feminist girl-power hero (ie anything the male hero can do I can do better)
We don't get real women heroes. We don't get the woman that maintains a day job, has a husband at home, and heads out to fight crime at night. Or the female trust-fund kid that loses her parents in a tragic accident and develops skills/powers instead of a drug habit and becomes the world's greatest detective.
Instead we get "female fighter pilot and former girlfriend of an intergalactic space hero that develops powers and spends her days proving that girl heroes are just as good as male heroes" or "cousin of the hulk that spends her days proving the comic industry is male-driven and that just because she's attractive doesn't mean she's not smart"
OR we get Squirrel Girl that gets date raped by who=knows-how-old Wolverine and even though she defeats Thanos is relegated to the c-squad.
Then there's Jessica Jones....was a good comic, then turned into a party girl with an alcohol problem tries to one-up all the male heroes
Imagine if male heroes went around trying to prove how much better they were than the female heroes "to put them in their place"...oh wait, that's the Golden Age of comics....
How about reality. How about a teen girl that develops invisibility and spends time trying to break into the boys(or girls, to each their own) locker room to see naked people? How about she screws up and shoplifts and gets caught by an older hero that mentors her and she becomes a stand-alone hero worthy of a title while also trying to go school and get a degree instead of becoming a drunk like every other powerful female hero seems to.