None of the mannequins in the mall -- male or female -- had heads; some like this one had something clever but non-human in its place. I don't know much about Islam, but Ali is correct, as I understand it -- the avoidance of the human figure in art stems from the prohibition against idolatry in the Quran. From Wiki: "Typically, though not entirely, Islamic art has focused on the depiction of patterns and Arabic calligraphy, rather than on figures, because it is feared by many Muslims that the depiction of the human form is idolatry and thereby a sin against God, forbidden in the Qur'an."

Another shop window, this one very pricy: