Databases and indexes are the best places to find the articles you need. Databases and indexes are collections of articles that you can search by topic, subject, author, etc.
A good place to find databases and indexes is MLibrary's Search Tools site. Search Tools does not search for articles, rather, it searches for databases and indexes that contain articles. For example, if you are looking for an article on Michelangelo you might want to search Search Tools for "art." You will then be provided with databases and indexes that relate to art, you choose one that sounds relevant to your research and then search it for "Michelangelo."
Once you have completed your search, look for the phrase "Availability at U-M" or the "MGet It" button in order to access the article.
The following links are for general databases and indexes. These databases and indexes can be searched for the specific topic you are looking for (Michelangelo, Picasso, Japanese sculpture, etc.).
Finding Articles - Art History Journals
These journals are dedicated to the art history discipline. They inlcude articles related to a wide variety of art history subjects.
If you are unable to find the article you need through MLibrary try requesting it through Interlibrary Loan. Interlibrary Loan obtains items that are not available at the University of Michigan Library for the study and research of the University's patrons, including: books, dissertations, and microforms, copies of periodical articles or short sections of books.