|~~~~Critique Club Comment~~~~
If it wasn't for the challenge and the title I'd say that there is bit much of empty space above the silhouette. For a silhouette it is a nice image, the composition of it is pleasant and the different types of tree provide different textures to prevent a boring view. The small resolution took away some of the detail. :(
In this case (talking about the blue sky as the main subject now), the silhouette adds something interesting, nice and well done. I also like the color graduation behind the trees, be it on the soft side.
Camera Work (Technical)
The exposure that resulted from the camera work and post processing is good. The silhouette is completely dark.
The blue sky shifts from whiteblue in the left to a darker blue in the upper right. Was it taken with a polarizer on, it is something you often see with polarizers used at a less perfect angle to the sun. The polarizer might make the sky blue'er when you haven't used it. I believe the S40 has possibilities for that..
Digital Processing (technical)
Good job. Very clean sky.
As it is, too empty, but met the challenge well.