Part 1 - sunlight and under cloud
In bright sunlight (end of the day) casts strong shadows and highlights.
Cloudy conditions give a flatter lighting more suitable for the delicate texture of the moss on the tree.
Again bright sunlight makes for interesting colours and contrast but the exposure under cloudy conditions gives a better impression of a winter woodland scene.
This is an image that would not have been improved in sunny conditions. The shadows cast would have added confusion to an already busy image. Showing the construction of the arch made from coppiced wood may have the structure even more difficult to see.
Part 2 - images taken on a cloudy day featuring texture and colour
Part 3 - rain