So, when people have planes that they fly in the sky, sometimes they like to make them look really cool by painting pictures on them. They call this "nose art" because the pictures go on the front part of the plane called the "nose."
The pictures are usually things like pretty girls, animals, or things that are important to the people flying the plane. Sometimes they're funny or silly pictures too.
Nose art started a long time ago, when people were in wars and wanted to make their planes feel special. They wanted them to stand out and look different from other planes.
Nowadays, people still like to do nose art on planes, even if they're not in wars. It's a fun way to show off your personality and make your plane look unique.