This is a beautiful and holy thangka. Most old thangkas have inscriptions on the back, usually the mantra of the deity depicted. Thangkas are hung in temples, monasteries, homes as blessings and to support the Buddhist meditation and practice. Practitioners use thangkas to develop a clear visualization of a particular deity, strengthening their concentration, and forging a link between themselves and the deity.
May those who view this piece of exquisite holy thangka be planted with the seeds of enlightenment.