the janissary were turkish infantry mostly. they hard rather distinctive head dresses.
their mounted officers & siphahis wore the more distinctive large turkish turbans as per the later posted statue. the OP's statue's head dress looks more arabic to me.
looks like an earlier style of the ghotra.
(townies wear white ones, the checkered ones are worn by the bedou (and ferengi 
.)
reminds me of this saudi bedu falconer with his cased rifle, ammo/sword belt.
(this photo used to hang in ARAMCO's HQ in dhahran, was given to me by one of the VP's as a parting gift when i left saudi arabia. it hangs on my wall even now)