The link below is from the Sloane Art Library's Art & Design Research LibGuide that may prove useful in your image search: https://guides.lib.unc.edu/Art_Research/images
"The Latinx-related objects and archival collections at the National Museum of African American History and Culture traverse racial identifications and national boundaries. This online portal is a guide to exploring the diversity of our Latinx-related holdings." (NMAAMHC Website)
https://nmaahc.si.edu/explore/collection/latinx
International Center for the Arts of the Americas at the Museum of Fine Arts, Houston- Explore over 9,000 Documents of 20th and 21st-century art in Latin America, the Caribbean, and among US Latino communities:
http://lanic.utexas.edu/la/region/museums/Although the LANIC site is no longer maintained, the listing of museums in Latin America may prove useful"