When the photographer takes into account the architects intentions for laying out a given room, the window shapes, the views & capturing the quality of materials used is vital. The compositions may not just be the expanse of the room at the widest angle possible as in most real estate photo shoots.

An interior designer puts a lot of work & intention with colors they choose. A design photographer tries to match those colors as close as possible if not exact. Designer's choose specific products for their textures & lights for their details. This requires a variety of lighting techniques to capture the setting, as well as extensive post processing knowledge.

More time shooting, more time post processing, more focus on quality, a striking finished product that catches the viewer's interest & retains it longer.