I'll probably stay with the body as it is but rework the head.
And some clothing ideas:
I'll probably go with the top left one since it seems to fit the "shadow" theme best, though bottom left would do for keeping the creature Vishnu-like.
Weapons - the lower arms will hold patas (http://en.wikipedia.org/wiki/Pata_%28weapon%29) (Indian weapon, so it fits the idea perfectly), the upper arms will use a shield and spear combination or some godly magic bow of smiting the evil ;).
Devanagari (http://en.wikipedia.org/wiki/Devanagari) might be used for decoration.