Does anyone know what traditional clothes this is and the origins/inspiration of the armour? It must be middle eastern. Ottoman perhaps?
I was curious and actually asked the artist after starting following him on pixiv. He said: "Hello! The reference source of the armor is ancient India, which should be the Mughal Empire or the Rajputs. The girl's clothing refers to the nomadic peoples of Central Asia, and the world view of the work refers to the ancient Central Asian Khanate. Thank you for liking my work!"
Sign upside down, door that's supposed to be closed slightly open with person staring at you, excessive signs, stuff oozing out the vent, face on the ceiling, tile guy at the end of the hall, and a wave of water rushing in.... it's all probably normal and safe to move forward.