Narrow-diameter, white PVC pipe capped on one end makes an inexpensive, safe stake. Painting steel stakes a bright color such as yellow or orange will help when relocating the stakes in future years. Record the compass bearing and distance of the plot frame location from the witness post. If possible, always place witness posts the same direction and distance from all photo plots. A plot sign should be included in the plot photo.
White paper is too bright.
Orient the photo plots so that the photographer stands on the north side of the plot. This way his shadow won't cast across the plot and interfere with the picture. I prefer to take the plot photo at an oblique angle from about 3 ft. away. Some people prefer to stand next to the plot frame, hold the camera at arm's length, point the lens at the ground and take a vertical picture from above the photo plot. The general view picture should include a distinct landmark in the background to insure that the photograph can be repeated in the future.