Attempts to improvise comic

Attempts to improvise comic - student project

Hello everyone, I want to clarify the humor of the comics, well my mother tongue is Spanish and I'm not sure if it's the same as the onomatopoeia of the ghosts "boo" in English, the "buu" sounds the same as the onomatopoeia to booing in Spanish.

Here is my first attempts to improvise comic, they are not the best but I will try to improve Suggestions, advice and recommendations are welcome! Thank you.