Deleted article for creation - Chisenhale Gallery 

Dear Joe,
Please could you explain why you deleted the Article for Creation: Chisenhale Gallery? You cite the reason that it contains copyrighted material but I'm afraid I don't understand what you are referring to here. 
I am new to Wikipedia and at the moment am entirely mystified. If you could explain in the simplest possible terms I would be extremely grateful. 
How do I move forward to get this article accepted?
Many thanks.