http://www.getty.edu/education/teachers/building_lessons/formal_analysis.html
https://writingcenter.unc.edu/tips-and-tools/art-history/
https://smarthistory.org/introduction-to-art-historical-analysis/#:~:text=Visual%20(formal)%20analysis,-Art%20historians%20use&text=To%20describe%20visual%20properties%20systematically,color%2C%20light%2C%20and%20texture.
https://smarthistory.org/visual-analysis/
https://smarthistory.org/line/
https://smarthistory.org/balance-symmetry-and-emphasis/