Temple exterior - Outer parapet wall of the Mantapa
The outer parapet wall of the open mantapa has a total of 140-panel sculptures with depictions from the Hindu epics. The Ramayana is sculpted on the south side wall on 70 panels, with the story proceeding quite unusually, in an anti-clockwise direction.
You can see them here Temples of Karnataka.
Quoting from the above website,
"The story (of Ramayana) is divided into seven main kandas as per Valmiki (Bala, Ayodhya, Aranya, Khiskinda, Sundara , Yuddha and Uttara Kanda. In this temple (at Amruthapura) Uttara Kanda is missing."
The entire Ramayana can be seen unfolding on the walls of Amriteshwara temple. The story begins from when King Dasharatha performs a fire sacrifice called the Putrakameshti Yaga. The final relief is of Lord Rama defeating Ravana to reunite with Seeta.
Some more sequences from Ramayana
Krishna Leela and Mahabharata
On the northern wall, 70 panels describe the sequences from Krishna Leela and Mahabharata.
Of these, 25 of them depict the life of Krishna from Bhagavat Purana. The images below are some of the panels. Some more images from Mahabharata can be found here Puratattva.
There are 45 panels that depict the scenes from the Mahabharata. Below images show some of the panels. The reliefs start from Kunti asking Bhishma for help after her husband passes away. The reliefs depict many incidents from Mahabharata such as Lakshyagriha, Khandava Vana Dahana, and the finally end with the Mahabharata war scenes.