Note the lakshanas seen here:
- the urna or dot between the eyebrows- the ushnisha or cranial bump
- the mudra or hand position (here, teaching the wheel of dharma)
- elongated ears
- simple monk's robe
- the asana or posture (here, meditating)
- lotus seat (here the folds of his robe & not an actual lotus)
- wheel symbols on feet
- halo behind the head
(not all these features appear in all Buddhas or in the same way)
Other Resources:
- Wikipedia article on Sarnath
- Buddhanet article on Sarnath
- Gupta period Standing Buddha (Metropolitan Museum)