The picture is framed at an odd angle. Common to game CG where artists try to fit tall people and situations onto wide images, but don't want to put the images sideways. Term originates in filmmaking, also known as German angle or Batman angle.
Basically if you find yourself tilting your head to one side in order to see the picture in proper perspective, this tag is appropriate.
- post #4243732: Dutch angle
- post #4243734: No dutch angle