I'll give you an absolutely honest answer:

I don't know.

If pressed I'd probably say -- nothing, everything. I don't categorize in this way. There's nothing particular "womanly" -- other than the prescribed arrangement of the lady-parts -- that is particularly attractive to me.

In general, I have tended not to be attracted to prissy women or to very skinny women (if I can see your bones, I'll pass), or very quiet women. But that doesn't mean I couldn't be if there were other, ill-defined or undefined, qualities that overcame them. I suppose I'm very democratic (small-d) in that regard.