Q. Do I have to cite a photograph that I took myself?

Yes, for MLA you should follow this set up:

Last Name, First Name. "Photograph Title/Description." Year Created. Digital File Type.

For example:

Smith, John. "My Treehouse." 2009. JPEG file.

For more information, check out this library guide from Manhattanville College Library, or this one from the California College of the Arts.