I, too, noticed the haloing, but did not want to be overly critical of an otherwise beautiful image. Since others questioned the phenomenon, here's my 2 cents...
Looks like the image may have been processed in Photoshop. This type of halo is very characteristic when, for example, the selection of the sky apart from the mountain top/trees is not accurately refined. This often shows up in highly detailed areas. Note how the halo floats right above and follows the tree line.
There are tools and techniques to easily remedy this issue.
If I'm wrong about post processing in PS, it's a mystery to me.
Perhaps Shailendra will comment when he logs in again.
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