References to La Bruna on the internet often link to The Marian Library at Dayton Universiy. Unfortunately, the author of the article cites no sources to support his subjective interpretation of La Bruna.
For those who want sound teaching on the meaning of icons, the following books are foundational: Art of the Icon: A Theology of Beauty by Paul Evdokimov and Fr. Steven Bigham
The Meaning of Icons, by Vladimir Lossky with Léonid Ouspensky
Behold the Beauty of the Lord: Praying With Icons by Henri J.M Nouwen