Istanbul wall art is dominated by two things: the mosques and the water. Roughly half the range is architecture, chiefly the Blue Mosque and Hagia Sophia, and most of the rest is the Bosphorus at sunset with the skyline behind it.
Those two groups suit different rooms, and the light in the frame matters more here than the landmark does.

The Blue Mosque and Hagia Sophia are the anchors
Between them these two buildings account for most of the architectural work. They photograph differently despite standing minutes apart: the Blue Mosque is symmetrical, six minarets and a cascade of domes, usually shot straight on. Hagia Sophia is heavier and less regular, and reads as mass rather than pattern.
Choose the Blue Mosque if you want symmetry that rewards a centered hang. Choose Hagia Sophia if you want weight and texture. Istanbul Wall Art holds both, and Architecture Wall Art covers the wider treatment.

Sunset is the most common light, and it is not decorative
A third of the range is shot at sunset, and there is a reason beyond taste. Istanbul sits on water running north to south, so the sun sets across the strait rather than behind the city. The minarets end up in silhouette against a lit sky, which is the composition the place is known for.
That silhouette is what makes these easy to place. A backlit skyline carries almost no color of its own beyond the sky, so it sits against most wall colors without argument.

The Bosphorus bridges are the modern half
The suspension bridges appear almost as often as the mosques and give a completely different register: steel cables, traffic light trails and a modern skyline. A bridge at blue hour reads as a contemporary city, not as a historic one.
If a room is modern and a mosque would feel out of place, this is the part of the range to look at. City Wall Art and Navy Wall Art hold the same treatment elsewhere.

The Maiden Tower is the quiet one
The small tower on its islet appears often and behaves unlike anything else here. It is a single object on open water with nothing else in the frame, which makes it the most restful piece in the collection and the only genuinely minimal one.
It is also the one that works above a bed, where a dense skyline would not. Minimalist Wall Art covers the same idea across other subjects.
Which room takes which
A lit skyline or a bridge at night is a living room piece: it carries detail, and it rewards being looked at repeatedly from across the room. A backlit mosque silhouette or the Maiden Tower is low contrast and suits a bedroom or a dining room, where the piece is viewed at close range while seated.
The living room guide covers sightlines and the bedroom guide covers why low contrast wins above a bed.

Sizing, and why the skyline wants width
Istanbul across the water is a wide subject with a low horizon and landmarks spread along it. Crop it and the relationship between the minarets and the water disappears, which is the picture.
Panoramic covers 36 x 12 to 73 x 24 inches and holds that better than any other format. Horizontal runs 1 Piece, 3 Horizontal, 4 Pop, 5 Star and 5 Pop from 24 x 16 to 82 x 42 where more height is wanted, and a single mosque shot straight on suits the vertical range at 12 x 24 to 24 x 49. Size to about two thirds the width of the furniture below with the center 57 to 60 inches from the floor. The sofa sizing guide has the method.
Quick answers
Common Questions
What is the most common subject in Istanbul wall art?
Mosque architecture, chiefly the Blue Mosque and Hagia Sophia, which together account for most of the architectural work. The Bosphorus at sunset with the skyline behind it is the second group, the suspension bridges the third, and the Maiden Tower the quiet fourth.
What is the difference between the Blue Mosque and Hagia Sophia as artwork?
Symmetry against mass. The Blue Mosque is regular, six minarets and cascading domes, usually shot straight on, so it rewards a centered hang. Hagia Sophia is heavier and less regular and reads as weight and texture rather than pattern. Pick by which quality the wall needs.
Why is so much Istanbul photography shot at sunset?
Geography. The city sits on water running north to south, so the sun sets across the strait rather than behind the skyline, putting the minarets in silhouette against a lit sky. That backlit shape is the composition the place is known for, and it carries almost no color of its own beyond the sky.
Which Istanbul piece suits a bedroom?
The Maiden Tower or a backlit silhouette. Both are low contrast, with a single shape on open water or against a graded sky and very little detail to read, which is what makes a piece restful above a bed. A lit skyline or a bridge at night belongs in a living room instead.
What size canvas suits an Istanbul skyline?
Wide. The picture depends on landmarks spread along a low horizon, and cropping destroys the relationship between them. Panoramic from 36 x 12 to 73 x 24 inches holds it best. Size to roughly two thirds the furniture width below, with the center 57 to 60 inches from the floor.