As this photo exists now, it is missing a focal point and color interest. Perhaps if you could have had a branch in the foreground it would have added some color and contrast.
There are two main lines of trees to this shot - the darker ones slightly to the foreground, and the misty slightly lighter ones in the background. However, since the shot is so gloomy, its very hard to tell them apart, so the depth that the mist should have given is mostly lost.
The trees and mist fill the frame well, but there's no focal point or points in the image, so the eye tends to just wander around, rather than going to any particular point. The lines of the shot are good, but I feel that the shot could do with a bit less of the bottom of the frame, and a bit more sky, which would at the same time put the tree lines on the RoT lines.
Background:
The background is an integral part of this landscape, so I can't say much more than I did in the above.
Camera Work:
The focus and DoF seem reasonable on this shot, considering that its a foggy / misty scene, but without specific camera details (Aperture, ISO, Shutter) I can't really say much more.
Post Processing:
Since you've not provided any details, I can only guess as to the post processing you've done, if any. One important thing to mention is that this shot is only 108Kb, out of a maximum 150Kb, therefore you may have lost a bit of detail by compressing the image down to that size - I always recommend that you try to get as close to the 150Kb line as possible, so that as little detail as possible is lost.
Since this shot is so gloomy (due to the mist), it may have been worth adjusting the levels to get a bit more contrast between the foreground trees and the background trees, which would add more depth to the shot. Also, given that this photo is nearly monochrome, perhaps making it a b&w shot would have helped make it feel more misty.
For an example of what I mean, I took the liberty of downloading and post processing this image myself - you can see the finished result here (I appreciate that this is your copyrighted material, so please PM me if you want me to remove this image from my website).
My Opinion:
I personally think that this shot meets the "landscape" challenge, but it definitely doesn't do anything more than that. The general gloom and lack of any real focal point means that there's nothing in the shot to get interested in, which makes this a below average to average shot.
If you have any questions about this critique, please feel free to contact me via the PM system.
I like the misterious Hound of the Baskervills feel of this image, I would like to see some reference point I could use to get a feel of size and distance.