I decided to play around a bit with my editing software: I took a basic picture of a tree against the gray sky and played around with it in Paintshop Pro. I first converted it to B&W and then opened up the Topaz Adjust plugin and applied the "Lowkey II" preset to get this final image. The final result looks a little foreboding and dark. I think it looks pretty good but it could probably be tweaked some more. I'm looking forward to learning more about all of the image editing features that are available to me.