Palmyra's natives are originally bedouin tribes linked to Arabia. Their traditions and Arabic dialect are quite different from Western Syrian cities. Many of them still wear the red kufiya worn in the Arabian peninsula. The main one in the photo was intriguing because of his red hair, which is surprisingly common in Aleppo and Damascus, though rare in Palmyra.
Syria is sometimes (rightly) called the cradle of civilisation. Many languages originate from there, like the ancient Palmyrene alphabeth. The first western alphabeth, or one of them at least, was developed in Syria. The first Syriac alphabeth developed from a later form of Aramaic used at Palmyra in Syria. At the museum in Palmyra there's an interesting rooms dedicated to this mysterious language and its evolution
Camels are a common sight in Palmyra, being in the desert and all. They make good subjects for photographs.
Since Palmyra was a center for many different cultures, you will find areas like this that have writings in multiple languages.