The green light coming out of the ground, the unvisited altar(where Issun says looks like noone has visited in a while, we should leave an offering), and the statues of a wolf that "has the same blank expression as me?"

im also confused about the unvisited altar, but the green light is a place to dig so u can get treasure, and the "blank expression" statues r used for a brush technique u obviously haven't found yet. i wont give anything away about which it is.

The green light coming out of the ground is a place where you should dig. If you dig there, you'll find a Clover. Use the Bloom technique on it for some extra Praise. (There's one clover in the game that gives 50 PRAISE!!)

As for those statues, there's a guy called Nameless Man (Yes, that is in fact his name). When you restore his kiln by trashing a Devil Gate, finish Tsuta Ruins, then come back and he'll make vases for you. Pick up the vases by biting them and take them to the statues.

For the blank expression statues, is it kinda clawing upward but looking at the ground?