Normally the photo will have an explanation/legend to the side as to what the markings mean and what they stand for. It's similar to reading a map or a blue print. There should be directions so anyone who is interested can clarify details in the photos.
Or it could be part of a happy face :)
I am a licensed Realtor in Malibu. I would love to help you with your questions regarding purchasing a home. I specialize in Malibu Sales and Leasing. Feel free to contact me by phone or email with any questions that you may have.
I look forward to hearing from you.
Luxury Estates Director
CA. DRE. Lic # 01830996
Prudential California Realty
Beverly Hills, CA