whoops....should have pinged you to # 51.
seems that most of the depictions featured on that website have their origin in Persia.
Very interesting - in top 3 pictures there Mohammad looks Central Asian (slanted eyes)! as he does in several of last pictures, namely from Afghanistan, Turkey and Uzbekistan. Am not totally surprised, maybe a bit of Mongol influence after their invasion and during their rule, given the timeline mentioned in your link. Btw, Al-Biruni was not a “Persian”, he was an Uzbek, born there too. Though because today’s Uzbekistan was part of the Persian Empire, others call him “Persian”.
In publicly displayed paintings I saw back in Iran long ago, Mo and shia imams looked distinctly Arab - facial features and all.
I also recall one or two religious programs (mini-series) on tv in Iran back then about Mo and especially the 3rd shia imam Hussein. But, in those series they never showed their faces.