If you take a photograph and wish to use it in your writing, you do not have to reference it. To show you own the photograph you should put “Author's own image” to the caption you add underneath your image.
Image 1: Give image a title (Author's own image)
If you want to refer to unpublished photos or images include them as an appendix not as a reference – your tutor will need to see the images you are referring to in order to understand their relevance.
If the images are published e.g. on a Blog or Instagram, you can refer to that website, naming yourself as the author. See Blogs in menu.