I adore the lighting, the colours and the clouds/mist. It has a beautiful feel to it.
I like the tree alot but think it looks a little too regular.
I don’t understand the tunnel thing - it seems a little irrelevant to the picture - but that might just mean I don’t understand the picture very well.
Overall nothing I could do in a hurry - or even at a painfully slow pace.
Regards
Caleb
Nice picture.
Reaaly good mood and great ligtning.
i like the effect of the bricks on the left.
nice - great Enviroment, materials and colors.
so how long it took to render ?
Caleb: Thanks 
KRunchy: I’m not sure. I was blending/coding/watching tv on my other box while i was rendering it on this one, but iirc it was > 2 hours.
koudejogen, WharchyId: thanks
Nice! Nice, nice, nice. Not much to say. Looks great.
thanks for the C&C.
I think that if a tree had been sitting infront of a wind tunnel most of its life, it’s branches would look quite smooth, although they would also be very thin.
Anyway, I like the picture. 
I dig the lighting and fog effects… as previously stated, the sky is also cool. Nice composition for sure. Cudos.
Brilliant Blackmage!! The theme was hard to find but i got it!!
10/10
very nice there very nice.