The meaning of Green Tara is goddess of compassion, and why she sits with one foot extended is because she is ready to come to the aid of the suffering in an instant. She is a goddess of compassionate action and protection.
The 9 Stages of Mental Tranquility of Shamatha meditiation. Here a monk chasing, binding, leading and subduing elephant whose color progresses from black to white. The elephant represents the mind and its black colour the gross aspects of mental dullness. The monkey represents distraction or mental agitations. Tibet Thangka