Did your scanner sharpen the images? I feel the same as a few people above who have said that the first two frames look pretty over-sharpened. I think the amount of contrast MIGHT be okay if the photos were not so sharp but it is hard to tell.
I would ask about your scan settings but I know APUG doesn't take too kindly to that sort of thing :P
3 and 4 are my favorite. The only thing that bothers me a little about 4 is how the focus was missed. It would have been okay if the entire frame was out of focus but, for me, seeing the branches in focus really makes me uneasy.
Anyways, overall a pretty good set! Mind sharing what you shot this with?