Is it a historical photograph or a photograph published in a book that someone scanned and posted on line, is it a photograph of something like a sculpture? Is your paper focused on the work of the photographer, the makeup artist who prepared the model, the digital image enhancer who altered the image, the model? There is no single correct way to cite a photograph, because there are many different reasons to cite a photograph. Your instructor would be able to give you more specific advice. In general, though, the 8th edition of the MLA guide would say something like this:
A critical essay is an analysis of a text such as a book, film, article, or painting. The goal of this type of paper is to offer a text or an interpretation of some aspect of a text or to situate the text in a broader context. For example, a critical analysis of a book might focus on the tone of the text to determine how that tone influences the meaning of the text overall. Or, a critical analysis of a film might focus on the significance of a recurring symbol in the film. Regardless, a critical essay should include an argumentative thesis about the text and plenty of textual evidence sources to help support your interpretation of the text.  Keep reading to learn how to write a critical essay.
The reason a comma is put in between the book titles is because, while they are in quotation marks, they are still part of a list. When listing things, you put a comma in between each item. For example, if you were to say “He likes bananas, oranges, and carrots”, you would have to put commas between each item that “He” is said to like. How these commas are placed is a matter of debate for some people, since many are starting to avoid using the Oxford comma. If you do not use the Oxford comma, the sentence would read “He likes bananas, oranges and carrots.”