I personally like most aspects of female feet and how they all work together to form a unique picture. I definitely appreciate the tops as much as the bottoms and also have not heard many talk about the tops much. While I do often find the bottoms attractive, I have a hard time identifying with the seemingly very common hyper-fixation on the soles. There's nothing inherently wrong with it, but it's a hard lens for me to see through. In a way, though, so is the idea of foot fetishism as a singular focal kink. I find most aspects of a woman's body to be attractive, and I definitely include feet in that. Incidentally, I've actually been mulling over whether to start using the term foot kink instead of foot fetish, as I feel that fetish has historical implications of needing it to get off. I think I've come across one too many people over the years that see a woman as a beautiful pair of feet with an inconveniently attached body.
For the purposes of tickling, it obviously makes sense to pay a little extra attention to some people's feet for obvious reasons, but it does drive me crazy that many people don't also tickle the tops of the feet!