I don't consider it ridiculous to support Wikipedia policy against original research.  As such, I don't consider it ridiculous to ask for a source to be provided for unsourced information, regardless of how reasonable it may seem to you or others.  I am not claiming that she isn't Iranian or that she is a slave, but merely raising the possibility to you so that you realize that we need to use sources on Wikipedia.  So how about you just find a source that explicitly describes the woman pictured as "Persian?" It's as simple as that, assuming that you derived your statement from sources but forgot to note them.  This will, however, be much more difficult if your claim is indeed original research (as I suspect).  If this is the case, then for the future, please don't add original research to Wikipedia, Zereshk.  Thanks in advance for compliance.