I would have to say that I am not sure about what has been said about the translucency of the leaves (RE: Needles) since we're dealing with conifer like trees, given the sun angle, the Point of view, the angle of the camera relative to the sun and the amount and position of the clouds I'd say the lighting of the trees given these factors seams correct. If is important to note that Conifer Forests have an Albedo level between 0.09 to 0.15 whereas deciduous trees (Broad Leaf Types) have an Albedo value of about 0.15 to 0.18 meaning that Conifer Forests will always look darker.
From a compositional standpoint the darkness of the trees gives weight to the sides of the image forcing the viewers eye into the image, it also sets the desired emotional resonance when viewing the image, which IMHO is the point, all that aside "Each to their own" as they say.
Regards to you.
Cyber-Angel