Red spider lily, also known as manjusaka, one of the four flowers in the "Avatamsaka-sutra ".
The skulls into the flowers, a symbol of life and death, the hands of Buddha holding the flower's stem, that means: If you have the wisdom (Prajna), you can from "this side of life and death" crossing to "the other side - Nirvana (Paramita)."
At bottom is the Tibetan: "This side of life and death, the other side - Nirvana (Paramita)".
The back you can choose one of two images:
A. The hand of Buddha holding the "Prajnaparamita Sutra";
B. The Naga holding the "Prajnaparamita Sutra" , Nagarjuna then get it, so he finally crossing to the other side(Paramita) and become the Buddha.