Searching "happy_trail -male" gives you a few results, likely the ones you've already seen.
The chances of finding that on a female is very unlikely since most guys tend to dislike seeing women with body hair of any kind and our available images reflect that.
My girlfriend has a slight happy trail. She's a natural blonde so the hairs are small and extremely light. I barely notice, but when I do I think it's cute. Then again you probably mean pictures YOU can fap to, huh?