Mark weet van iets
"Mark knows about something" doesn't provide any specific information or context that makes it possible to create an AI picture from it. Here's a more detailed translation:
"Mark, a middle-aged man with glasses and a beard, sitting in a well-lit library, staring intently at an open antique book. He wears a thoughtful look on his face as if he has just discovered a hidden truth that was previously unknown to him. The library is filled with tall, wooden bookshelves that reach towards a high ceiling, and a green desk lamp offers him light. His brow furrows as he takes in the information from the worn pages of the book, suggesting that whatever he now knows is of great importance."