Website with a good introduction on different styles of art historical writing. For the research paper, you will need to combine different styles so focus on visual description, iconographic analysis, and historical analysis.
The Met's online resource for art historical research. You will find general essays, essays on specific works of art, historical essays, as well as chronologies with specific works of art. This is a good general source.
Schwartz, Ellen C. The Oxford Handbook of Byzantine Art and Architecture, Oxford: Oxford University Press, 2021.
An introductory text on Byzantine art and architecture. You will need to request this book through interlibrary loan.
An online database where you can search for articles based on topic, author, or title. Refine your search to peer-review articles published after 1995.
The library is an excellent resource. You can search the catalogue for books on your topic, and the librarians are very helpful. If you need help finding sources, I highly recommend reaching out to them.