Why should you have professional photography for interior design? You want a photographer who is well versed in interior photography and better yet someone who has experience with interior architecture photography, as well. You want photos that highlight the best parts of your work, details that will help your interior design expertise stand out.
An interior design photographer will find camera angles and set up lighting in particular ways. The lighting can make the colors in a space pop and brighten it in a way to make it more inviting. The right angles will make a space seem larger than it really is, making it more memorable.
If you put an amateur photo taken on a smartphone and put it side by side with one taken with a high-definition digital camera by a professional photographer, the differences will be quite striking. Even if the subject is exactly the same, the professional one will be brighter and show off many more details.
Professional photos are high-quality and feature good lighting and impressive angles. They will represent your work far better than pictures taken by an amateur photographer. Even if you might consider yourself a good photographer, having a trained eye inspect a space and stage it properly makes a big difference in the final product.