Velma is an important witness for a case of robbery, so she is trying to cooperate with the cops by giving them instructions of how the man looked like. It doesn’t have anything to do with ghosts or haunting houses, but since she also asks people for information when it’s a case for the Mystery Inc, she knows that she can give a lot of help to the police. She will describe briefly who the guy was, for her didn’t had much time to see his face before losing her glass, but that might be enough for someone so skilled with drawings like you. You must create the sketch and it has to be perfect, otherwise the cops won’t be able to look and find the right guy before he escapes. Take a deep breath and listen carefully to each detail, because every single line of his face is important.