This is the right side of the aspe that housed the Christian altar. The top of the Islamic mimbar is at the bottom right. It is offset from the center of the apse. The mosaic at the top left is the Madonna and Child, while the one to the right of that is the angels Gabriel and Michael.
The Aya Sofya was built as a church by Roman Emporer Justinian in AD 537 and was converted to a mosque in 1453. The building is now a museum. There is almost no light inside the building and flashes are not allowed, photography is extremely difficult.
High up inside one of the apse, the Virgin Mary with the infant Jesus look down on the Hagia Sophia
Angel Gabriel Mosaic Detail – Hagia Sophia
Offering the Christ Child the Hagia Sofia on the left and the city of Istanbul on the right