They are both possible. ". The "subject" is the main (and often only) person (or object) in the painting.
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soheil1In most of the paintings, the emphasis is on a figure from the religious class, mystics and Sufis, or an official governmental figureIf it's absolutely necessary to put it the way you do, I like "the focus is on..." better. Just naturally focus as such has more to do with literal images, than "emphasis". Emphasis has