Avoid creating too many small details, as this can make the image difficult to perceive.
Don't forget about the body proportions, otherwise your robot knight may look ridiculous or unnatural.
Avoid using overly dark or muddy colors, as this can make the robot knight less noticeable against the background.
Remember that creating the robot knight is just the beginning. To add interest, try placing it in an impressive setting, such as against a castle background or in a battle scene.