Here are some options, ranging from formal to informal, that convey a friendly and respectful greeting:
Formal:
* きれいですね (kirei desu ne): This means "You are beautiful," and is a very polite and respectful way to compliment someone.
* お美しいですね (o-utsukushii desu ne): Similar to "kirei desu ne", but slightly more formal and elegant.
Informal:
* 可愛い (kawaii): Means "cute," and is often used to compliment someone's appearance.
* 綺麗 (kirei): A shorter and more casual version of "kirei desu ne."
* 素敵 (suteki): Means "wonderful" or "charming."
Remember:
* Context is key: The best way to greet someone depends on the situation, your relationship with them, and their age.
* Tone of voice: Even if you use a polite phrase, a suggestive or overly familiar tone can make the greeting inappropriate.
* Body language: A smile and a friendly demeanor can go a long way in making your greeting feel genuine.
If you're unsure, it's always best to err on the side of caution and use a more general greeting like "こんにちは (konnichiwa)" which means "hello."