No, odf, please don't.

She's "your" girl, so she only needs to look exactly like "you" want her to.

Like "my" figures only need to look exactly like "I" want them to.

And definitely not all my morphs are of the cutesy cute variety.

Meet Elke and Hana, for example:

It's just polygons, after all.

Only if you "need / want" to appeal to the largest number of people / customers possible, then, yes, "cute" will almost always win, so it should be the "default" look.

Human brains are pretty much hardwired that way.

But as I said, with enough polygons to work with, any look is possible, anyway.