Nicolas,
If Loretta Lux did landscapes, these would qualify. I really like them but have not analysed them in any way in making this remark. That's my 2 second immediate impulsive reaction.
Now I have spent more time, I see there's more to pop! As an experiement, try moving the center of the histogram in photoshop from 1.0 to 0.54. Not that the image is improved, but something worth experiencing.
I like the first picture best since it peovides context for the tree and would have even liked just a little bit more landscape and sky on the right and sky above for a classic composition.
If this is near you, devote yourself and you have a wonderful subject with no lights, makeup artist or wardrobe needed!
Thanks for sharing,
Asher