From the Purdue OWL MLA Formatting & Style Guide:
"Provide the artist's name, the title of the artwork in italics, and the date of composition. Finally, provide the name of the institution that houses the artwork followed by the location of the institution (if the location is not listed in the name of the institution, e.g. The Art Institute of Chicago).
Goya, Francisco. The Family of Charles IV. 1800, Museo del Prado, Madrid.
If the medium and/or materials (e.g., oil on canvas) are important to the reference, you can include this information at the end of the entry. However, it is not required.
For photographic reproductions of artwork (e.g. images of artwork in a book), treat the book or website as a container. Remember that for a second container, the title is listed first, before the contributors. Cite the bibliographic information as above followed by the information for the source in which the photograph appears, including page or reference numbers (plate, figure, etc.).
Goya, Francisco. The Family of Charles IV. 1800, Museo del Prado, Madrid. Gardener's Art Through the Ages, 10th ed., by Richard G. Tansey and Fred S. Kleiner, Harcourt Brace, p. 939.
If you viewed the artwork on the museum's website, treat the name of the website as the container and include the website's publisher and the URL at the end of the citation. Omit publisher information if it is the same as the name of the website. Note the period after the date below, rather than the comma: this is because the date refers to the painting's original creation, rather than to its publication on the website. Thus, MLA format considers it an "optional element."
Goya, Francisco. The Family of Charles IV. 1800. Museo del Prado, museodelprado.es/en/the-collection/art-work/the-family-of-carlos-iv/f47898fc-aa1c-48f6-a779-71759e417e74."
Last Name, First Name. Title of Book. City of Publication, Publisher, Publication Date.
Author(s). "Title of Article." Title of Journal, Volume, Issue, Year, pages.
Most articles found in library databases will be scholarly articles that should be cited in this format. If you find articles elsewhere, or aren't sure what kind of article you have, check the "MLA Citations for Periodicals" link above to help identify what you have.
It is a good idea to use a citation tool to help you with your citations. You can use either a citation generator or a citation management tool. Citation generators are great for quick projects like short papers with just a few resources. However, you should always check generated citations for errors (tip: there are almost always errors, especially with capitalization and use of italics).
A good citation generator is Zbib. Watch this quick tutorial video about how to use it.
For large projects like research papers or capstone projects, you should use a citation management tool. A good, free citation management tool is Zotero. More information can be found in this Zotero guide.