The prettier, the better! If her feet look beautiful, but are not ticklish, then I can always find other ways to enjoy them (such as massaging them and sucking on her toes). But if they are not the prettiest pair of feet, but they are ticklish, the ticklishness will make up for it (or the other way around). Also, if her feet are not as pretty as you like them to be, you can always either convince her to wear some fancy socks or sandals, or you can just focus on the part of her feet that looks the best (sometimes it could be the toes, or the arch, or the soles, or the heel). The one that is better (looking pretty or ticklishness) will make up for the other; each pair of feet is different and special in its own way. My fiance has pretty feet; the arches of her feet are prettiest part.