When I was in Dharamshala I bought a poster of the 21 Taras and brought it back to the U.S.

 begin partial quote from:

https://www.google.com/search?q=poster+of+the+21+taras&client=firefox-b-1-d&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjimamGg7j-AhVnJ0QIHbWfCgMQ0pQJegQIAhAC

 the 21 taras

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Rare 21 Tara Thangka | Traditional Tibetan Print | Taras Himalayan Art | Mother Tara Yoga Print | Tibean Poster For Meditation | Gift Ideas

 This is what the poster looked like.  So, if you do Green Tara mantras these are all the Taras you are praying to help you.