The Bodhisattva is seated in the yoga position with the left hand on his lap, palm up. The right hand rests on the kneeand points down to the ground. often slightly touching the earth. This posture know as ,calling the earth to witness, Know as Pang man wichai in Thai This very popular configuration in Thailand.
Narrative: Facing east at the Bodh Gaya the Bodhisattva is tempted by Mara and his horde. The demons offer him riches, power, sensual pleasure, etc, but all are scorned and the Buddha continues to contemplate. This conquest of Mara is actually a victory over himself.