The Blue Mosque is one of the highlights in Istanbul. The best place to photograph the mosque is from the terrace restaurant in the Seven Hills Hotel. I had a wonderful dinner there, spent about $40, and had the table the whole time from 7:30pm until around 9:30pm. They take reservations, ask for Nusret, sevenhillshotel.com. The photo is geotagged to the hotel. A sunrise shot would be great from this spot, but it gets light really early during the summer.