There are guidelines for how photos are used on the MLS.  Refer to the article on Copyright for rules associated with that topic.  Details for listing photos can be found in Section 1.2.1 in the Rules and Regulations and include the following.

1. At least one (1) photo, drawing, or rendition of the property shall be included at the time of Active status.
2. The image that appears first (either because it is photo #1 or it is flagged as the “primary photo”) must be specific to that listed property and can be either an exterior or interior image.
3. At least one (1) photo must be a ground level, front facing, exterior image of the actual structure for sale/lease and be one of the first six photos displayed for that property.
4. For a condo, apartment, or other multi-family dwelling, at least one (1) photo must be a ground level, front-facing exterior image of the actual building where the unit for sale/lease is located.
5. New Construction listings may use an artist's rendering of the listed property as the primary photo.
6. Vacant land listings are required to have a photo, graphic representation. Where applicable, any information with regard to the subdivision amenities must be uploaded and publicly available in MLS.
7. Sellers of properties listed in SOMO MLS have the ability to direct that photographs or other graphic
   representations of the property be withheld from the MLS compilation.
8. MLS may enforce the copyright and ownership of photos and/or artwork in the MLS that are owned by the original listing agent by removing the photo(s) in violation. Participants may not use photos or artwork submitted by another agent without specific written authorization.
9. Publicly accessible photos, videos, virtual tours, and other media shall not contain branding.  Refer to the article on Branding for rules associated with that topic.