Some time ago, I visited all the covens in the bay area and took the screenshots you can see here. This page is not quite finished, but since I already erroneously uploaded the navigation pointing to it, what shall I do
At the heart of each coven there is a witch constantly shifting ages. In some cases, that is all there is, like here in the Alcair Coven. The Coven of the Bluff in Daggerfall is rather similar, except that there are no trees and there's an altar beside the witch. Third of these simple covens is the Coven in the Marsh (Alik'r Desert), here seen at dawn:
Strangely enough, this coven is located not in Daggerfall, but in Shalgora. Here the main witch is located in the ruins of a tower, and accompanied by a single dancer.
Beldama Coven looks the same, as does the Coven of the Dust.
The Coven of the Peaks (Dragontail Mts.) is similar.