Five Glass Pumpkins
Sometimes, it is OK to let portions of an image become blown (pure white, RGB pixel values of 256,256,256). An image with a straight line near the border of the frame begs for a low distortion lens (or distortion-corrective post processing). Holding the camera level is another key - as is perfectly centering the frame from an also-centered shooting position. The purple wall is optional.
Camera and Lens Settings
85mm f/1.2 1/125s ISO 400 5472 x 3648px