If you want to practice, "cute shoes!" or some equivalent is generally a safe choice. "Those sneakers look really fast!" "Love the socks!" "Stylin' those shoes!" "Those sandals look really comfortable, and I love the sparkle!"
Because shoes are almost always a choice, and you don't have to make eye contact or avoid looking at other body parts. Just don't make it about their feet, or anything else they were born with, unless you're really familiar.
Frequently, but I'm a little old lady.
If you want to practice, "cute shoes!" or some equivalent is generally a safe choice. "Those sneakers look really fast!" "Love the socks!" "Stylin' those shoes!" "Those sandals look really comfortable, and I love the sparkle!"
Because shoes are almost always a choice, and you don't have to make eye contact or avoid looking at other body parts. Just don't make it about their feet, or anything else they were born with, unless you're really familiar.