I think your pic is Pali killed Torapee (the water buffalo) on the Ramakien, which is Ramayana in Thai version.
I know by the crown of the monkey and the story of Pali and Torapee.
Pali was Hanuman's uncle, he was King of Keetkin city and have green body.
Torapee was very strong buffalo, who killed his father (Torapa).
When Torappe killed his father, he challenge with Pali.
They fight on 7 days in the cave.
Finally Pali killed Torapee because the angels who protect Torapee were quit.
Sorry, I don’t tell you for more stories because my English is poor.

You can read on this link but it is Thai language.
http://www.bloggang.com/viewdiary.php?id=nayrotsung&month=04-2009&date=09&group=5&gblog=7
And this link is Ramakian in English.
http://www.seasite.niu.edu/Thai/literature/ramakian/introduction.htm

Best regards,
Mor