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Also note the interface at the corner of the wall and floor. The gap there is huge and the Spackle/plaster wave gives a clue of the scale.

Also the Arabic calligraphy is rather precise, as if handwritten. If it had been painted with a large brush, it would waver as the painter's hand would not be steadied (it doesn't appear to have crisp edges like it would if it was taped or stenciled.)

The circle in the middle probably was made with a circular stencil or template. An enterprising Pagamadeen might want to use the scale of the doll to calculate the size of the circle template, to verify that it is a standard size. The uneven paint saturation of the circle is due to a brush being dragged over a template, but not dabbed heavily (they didn't want to make it too obvious.)

The material is of fine weave (that is rather unusual too, since mostly they will use an old blanket or sheet, which would give clues to the true scale), possibly black silk or polyester. It doesn't hang like it has much weight. It almost looks like it is loosely stretched over cardboard. The paint along the right edge looks like the painter got some white paint smudged from his fingers there. A cleaver FBI agent might even get a partial print if they blow up the photo and run it through the computer.