Ce photographe est si creatif, c'est bizarre, Could you not say si as well as tellement, and bizarre instead of fou ?
you can say si for tellement.
What an odd thing to say about a creative photographer! Wonderful, astounding, exciting, innovative... might be better? But strange to imply he is mad?
I think "il est fou" would imply that he's mad. With "c'est fou", you're just saying "it's crazy" as a general statement about the situation.
This. It is simply an expression to say something is overwhelmingly impressive or out there; it is crazy to try and imagine it.