Bro although nandito ako sa UAE, halos parehas lang naman ang value ng pera between UAE and KSA that includes Qatar too. To answer your question, average sahod ng bagong salta without middle east experience is around 3,000 to 4,500 Dirhams that is around 30K to 50K pesos. Hindi pa kasali ang bahay and pagkain dyan.
Mas ok siguro kung tanungin mo yung nagaalok sayo kung magkano offer nila, tapos kung may accomodation na ba yon.
(place to stay plays a major role sa kikitain sa ibang bansa) Cost of accomodation in KSA is I think is much better compared to UAE which is sobrang mahal.
Syempre ang expected salary mo is based sa experience mo as photographer, or how skillful you are. Basta word of advice don't go for less than 3K riyals.