This model was birthed out of the trope in many different types of media and real life where a substitute teacher can be seen writing their name on a blackboard. A defining moment for that teacher and their students.
This works with all types of boards, including whiteboard, blackboard or chalkboard. You can incorporate any character and style into it. I have also captioned the text, so it does a relatively good job of writing the main text on the blackboard, albeit sometimes it can be surrounded by pure gibberish. But the main thing is it actually looks like messy chalk writing.
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Best way to structure your prompt is a photo of a (insert character) writing on a chalkboard, ((text "Insert Text here")). It's not limited to writing, you as you can also have characters pointing to the blackboard.
Useful prompts to use are chalk, school, looking back.