COMPOSITION
Framing the shot with the "frame" really adds to the composition of this shot I think. It draws the viewer's attention and focuses it on the subject of the picture. It feels a little off to me, maybe if the camera perspective was a little more to the left. Inside the frame, the rolling hill makes for some nice motion.
TECHNIQUE
The focus seems a little grainy, but I think that may add to the shot (more on this later). The grays, which would normally make for a drab shot, really add to the effect of this shot, as well, I think. I'm thinking I see some noise in the sky area, I don't know what your shutter speed, etc was, so I can't suggest anything in that area, but if you haven't ever tried NEATIMAGE or other noise reduction filters, they can really clean it up.
OVERALL EFFECT
A bit more fog, and your subject would be hidden completely! When I saw this shot, I immediately thought of the book "Wuthering Heights." It just has that dismal, gloomy, somber, mysterious aire about it. Nice work.
Nice window and way of bordering the hoto. Needs to be sharper focused. Don't feel this meets the challenge of hiding Waldo, but that's just my opinion.