Some of the provisions in health safety code prohibit disturbance of remains, except where specifically authorized. [1] There are other sections that require the written wishes of the deceased regarding the remains to be followed without undue delay if they are clear and properly funded.

Upon further looking, I can't find anything to back up my claim on photos. There have been various efforts to provide these from time to time, but it doesn't look like any of them resulted in passed laws, or case laws. There's some case law around heir's right to privacy with regard to photography of the deceased, but that doesn't seem well settled either.

[1] https://leginfo.legislature.ca.gov/faces/codes_displayText.x...