Cite Them Right Harvard referencing style:
See "Photographic Prints or Slides" and read the top box under the title to decide if you need to reference your own photograph or not.
If you do, the suggested elements for a reference are:
Surname, Initial. (Year) Title of photograph [Photograph]. Place of publication: Publisher.
For Example:
Thomas, T. (2017) Redevelopment in Byker [Photograph]. Newcastle upon Tyne: Then & Now Publishing.
If your photograph is unpublished, then it should be as above with your name, year taken and the title you have given the image. You can replace the Place of Publication and Publisher with Unpublished.
For Example:
Hassan, T. (2022) Eyelashes [Photograph]. Unpublished.