I just started reading this intriguing book. It is a fascinating subject philosophically and theologically. It is also a subject which has been avoided by many Protestant scholars both past and present.

The God Who Is Beauty: Beauty as a Divine Name in Thomas Aquinas and Dionysius the Areopagite (Princeton Theological Monograph) https://www.amazon.com/dp/1620322455/ref=cm_sw_r_cp_apa_i_2AA7Ab7WCHC75