Two wonderful faces on the north side of the monolith -  Be sure to explore the larger version of this image here.

Below are brief sketches with notes:

Top Face

The prominent eye, which easily goes inky black due to the shadow cast by the stone "bridge" to its right, goes completely through the stone, which may have given it extra significance to Avebury's creators.   From this angle the eye and face look like an owl. Interestingly, subsequent to my discovering this owl, I read in Di Pattison's book (p225) that she also found an owl's face occupying the upper right quadrant on neighbouring Stone 9! Although her Stone 9 owl is stylistically different to mine on Stone 10, the thematic and positional duplication on two neighbouring stones cannot possibly be coincidental, and shows the pair had a linked spiritual purpose. There we have it, two owls on paired monoliths.

Its also worth pointing out that this eye on Stone 10 forms one of a striking pair when viewed from the west. The eye has very distinctive "terraced" construction marks similar to those visible around the eye on Stone 15a visible here.

Bottom Face

The stone carving of the right looking face in the bottom half of the photograph here is quite charming and agrarian, transmitting a strong sense of character.   For an Avebury carving its unusually intimate, I feel it is a portrait of a real individual, not a god or spirit.