Opinion per req:
To be honest, they don't do a lot for me. #1 and 4 seem to have no discernable subject or point. The technical aspects of #1 are fine, it's focused, reasonably well exposed, but what are you trying to say?
#2. There's a little something here. Perhaps with an off-camera flash to illuminate the inside of the culvert a bit? As-is, the large, dark area is very distracting.
#3. I think you could have done more with this one. Perhaps tighter focus on a couple of the snails and the lock?
It seems to me that you're trying for an 'edgy' type of image, using a close-focusing technique, but I don't think you've quite found your niche yet. Keep at it; remember the beauty of shooting digital: Film is cheap!
Just my $00.02 worth - your mileage may vary.
~John