image purchased from CanStock
I have never written a book with a bimbo or stupid heroine. I have had them be a mix of professions-- artists, lawyers, teachers, decorators, office managers, photojournalists, singers, gas pump jockeys, wantabe journalists, and only one homemaker. Pretty much they are young women from their 20s to their mid 30s who might be virgins or have been in previous relationships. They are never promiscuous.
The woman has to be someone I'd like because once I start a book with her, I am going to be with her a lot of time. She has to be someone I could find as a friend. To spend a book with a dingbat would have me wanting to kill her off by the last chapter!
My heroines are all pretty but mostly its their character that draws to them the kind of hero who is worthy of a book. Beauty is good but interesting people are better.
Interestingly it does help to visualize these characters and buying images has proven to be one way I do that. Mine generally have come from CanStock with a few exceptions. When I need to put them into an historical period, I get creative with my photo-paint tools. The main thing always is that they have faces that to me reflect strength-- modern or historical women.
I should add that my heroine for the fourth Oregon historical, she's a warrior herself. First one I've ever written like that although I've written plenty who can become warriors when required.