Agni, god of fire
(circa 1830; Wikimedia - British Museum)
As you can read in the British Museum notes to this image, Agni's hair is done in a jata style and he is riding on a ram as his vahana. His lower right hand shows the abhaya mudra (no-fear), and his lower left hand is in the varada mudra (generosity).
More about Agni at Wikipedia.
