Iscuss the amalgamation of different cultural influences in the formation of Islamic art, with reference to architecture and decoration.

I would like it to be at a high distinction grade level.
No use of wikipedia please.
I will use this as a starting block as I havent written an essay in many years. My essay is to be 1500 words so I would appreciate if I could have guidelines in the margin. My main concern for myself is that Im not sure how to write a strong essay with a good argument and the type of words/language I should be using at this level.

Thank you