don't be a gorilla

The swinging arms. Some people are just too comfortable when bowing. Unless you want to look like you’re trying to touch your toes, avoid being a gorilla; keep your arms naturally at your side.

Don't be a bridhead

Although making eye contact upon first encounter is important, a mistake that foreigners (and even Korean kids) often make is maintaining that eye contact when bowing. What results from this stance: your neck sticks out while your upper body goes down, making you look like a bird. Not very attractive.