Art as a subject matter offers the one who deals with it extreme and, at the same time, rather baffling freedom. Different from any of exact sciences, it doesn’t confine you in the field of fact; you may, of course, choose an art essay topic to your interest and recite only widely known knowledge on this or that trend in art, but the subject itself asks for personal opinion and subjectivity.
There is a great variety of art essay topics that may be useful for somebody who deals with this discipline, and any of them can be treated in any way the author considers adequate (taking into account the appointed theme, if there is one, of course). For example, you may take a single artistic tendency, for example, cubism, and dwell on it, taking into account not only the artistic aspect, but the historical period in which it appeared as well, people who were important in its creation, give your suggestions on what lead to its appearance and so on.
Another popular type of topics for art essays and, actually, one of the most widely-spread one, is to select a particular person and write about him. It may be a famous (or, better, not-so-famous, in order to be more original) artist, or even an art critic or patron – in short, anyone who influenced the development of art a great lot.
Another typical kind of art essay topics is a single picture. There are a lot of paintings that are so famous that they are not less well-known as the people who crated them. Mona Lisa may serve as an example. You may go on forever writing about them: how it was created, in what circumstances, what was it further history etc.
As you may see, there is no end to all kinds of topics for art essays you may choose to write your own perfect art essay.