Great pics Dan, been seeing some real good photos in your albums, and got real excited to know you use a rangefinder, been wanting one for a long time. I've been looking at a Voightlander, but just got my Nikon D700, so It'll have to wait!!! jaja Keep riding!!!
I shoot most of my "adventure" bike stuff on Leica M8 rangefinders as it means I can carry the camera and 4 lenses and still ride how I want. It adds a certain look to the outcome. Using a wide 15mm (20mm equivalent on the M gets a little vignetting that adds a natural depth to pics. it worked for Ansel Adams! I dont do any 'photoshop' work on my pics though. Anyway, glad you like the shots.
I though it is an aftertouch cos it doesn't look like natural shadow... despite it is Anyway framing is great, contrast and colors look well thanks to both fine landscape and decent sensor And after all you've got amazing terrain for enduro trips! I don't complain about polish mountains, however I'm a little bit jealous of your trails
Morgins, France 
gets a little vignetting that adds a natural depth to pics. it worked for Ansel Adams! I dont do any 'photoshop' work on my pics though. Anyway, glad you like the shots.
Anyway framing is great, contrast and colors look well thanks to both fine landscape and decent sensor 
And after all you've got amazing terrain for enduro trips! I don't complain about polish mountains, however I'm a little bit jealous of your trails 
Keep riding!!!
Hasta luego!