Searching for articles about art and art history will include going across several subject databases (see suggestions below!), internet sources, and more! Try suggested keywords below, or add your own as you discover new facets of your research along the way. You will encounter many kinds of different sources, but you are looking for publications and online materials that have accurate and high-quality information. Note the domain (.com or .gov?) and content within websites (are there references? Do they lead to webpages that look high quality?), and don't hesitate to Ask a Librarian if you aren't sure!
Hokusai, Under the Wave off Kanagawa, c.1830. Ronin Gallery.