I suggest that you try your hand at writing an application here, and you may get some help. It is usually usually it is required that you hold an MA in the subject you wish to study on a postgraduate level. This is a mere draft, and needs revising with background info and clear specification about your thesis.
To the Department of Fine Arts at the University of _______
My name is _________ and I have a genuine interest in Fine Arts. I also hold an MA in...___________________ (background info)
The reason why I'm writing you this mail is:
I wish to apply for a position at the University of ______________ as a postgraduate student of Arts and conduct research within the field of ____________. I would be much oblidged if I could meet with someone in position to guide me, and I could certainly come with my own idea of a possible thesis for disseration.
I would be most grateful if you would accomodate my request.