There are several iconographies for this Indian adept, one of them depicts him with a mahasiddha appearance, holding a human hide stretched across his back, as above.
Alternatively, he may be seated in a relaxed posture on a lion skin, holding a skull cup filled with nectar. The other hand may display various gestures (in this case, bestowing refuge, ). This sculpture and the one below are part of two different sets of mahasiddhas.
On this example, he extends his right hand palm out in the gesture of supreme generosity.