Quote -  "Also I do not see why heroines should always be tall and have ballons attached to their chest."

Yeah the ballons do make her look cartoonish.

Well since where talking about cartoons.

Batman,Superman,are draw buy making there heads 5 eyes wide 7 eyes tall.
and ya draw there body 8 heads tall.

so that's 8*7=56
a human eye is about a inch tall
So if you put Batman,Superman in the real world that makes them 4 feet 8 inches tall.

Vicky follows the 5 eyes wide 7 eyes tall 8 heads tall art rule.

It's a Artistic trick that's been around for a long long time.

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The Artist that will fight for decades to conquer their media.
Even if you never know their name ,your know their Art.
Dark Sphere Mage Vengeance