It has been in storage and on my wall the past 30 years. Still in Excellent condition

The visible part of the painting  is 13.5 " long and 11.5 " wide

The satin brocade is 33" L and 21" wide

The cover can be rolled up as shown in the photo.

In Tibetan, the name is Chenrezik (སྤྱན་རས་གཟིགས)

Guanyin is the incarnation of wisdom and compassion in Buddhism. When all beings encounter any difficulties and pains and can recite the name of Guanyin sincerely, they will be rescued by Guanyin. The famous Potala Palace in Lhasa is considered to be the dojo of Guanyin Bodhisattva. Potala is the transliteration of Sanskrit,  translated as "Po Lo", referring to the island where Guanyin lives.  The "six-character mantra" (Om Mani Pad Mi Hum), which is well known to all Tibetans, is the mantra of Guanyin Bodhisattva. In Tibet, Songtsen Gampo is regarded as the incarnation of Guanyin Bodhisattva.

How can I tell?

Holding a jade vase and wearing a crown, she rides on a Golden Roar. Because she is dedicated to assisting Amitabha, and saving the world by seeking the sound of suffering, she has a Buddha statue of Amitabha on her crown.