Usually Islamic art is restricted to simple, repeated, symmetrical, geometric patterns or lines. They don't flat out draw overtly because there's supposed to be no central figure. But they did use animals (elephant, camels), humans, scenery and daily life that are incorporated and blended within the pattern (or sometimes without the usual patterns).

I don't think art can be fully regulated, artists will express, that's what they do.

Also, how about the Alhambra with the Court of the Lions?