In theory, the path to a PhD in the arts is simple: study hard as an undergraduate, find a topic that interests you and put together a proposal. When your thesis topic is the “depictions of mental health in decadent literature” or “just images in French new wave cinema”, the path, although strenuous, is neatly set out. If you work hard, the steps are clear and the work you do will be considered fulfilling and worthwhile.
However, there are ways to complicate this.