Edge out of shot
Check the viewfinder. Always allow a gap between the artwork edge and the viewfinder frame.
The Conductor Kay BlackieOil on canvas14" × 111.2" (36cm × 29cm)
The photographer didn’t leave a gap between the artwork and the viewfinder edge in the image above left. The image at left is the result when the correct gap is allowed.
Check camera’s position
Make sure the line from the lens barrel is perpendicular ...