How can I make these pictures better?

[Cheex]

Here are a few I got to edit tonight. Any advice on how to make them look better would be appreciated!

1.

Dark Abandoned Building by Chodie89, on Flickr


2.

Oregon Covered Bridge by Chodie89, on Flickr


3.

plant walk redo bw by Chodie89, on Flickr

4.

DSC_60501 by Chodie89, on Flickr

*I worked on the last one in ProphotoRGB and after uploading, it looks much darker on the internet )=

 

[Starskream666]

I can feel the mood of the first 3 and see where you were going with them and can also sorta see what you want to improve but, i think the improvements will be minor touchups.

 

[Compaq]

#2: I'd try and remove that sign by re-shooting or editing it out.

 

[thierry]

I like the first couple

 

[gonzoblasco]

1# and 2#, love them... Nice tip about the sign...

 

[KenC]

#3 is well composed and a good conversion, although I'd try to get a little more detail in the vegetation along the left side of the road. It also seems to get abruptly darker along the right side of the frame.

#1 might have been better as a vertical of the left side of the frame, with more of the ceiling and the left side of the structure. There's really not as much happening on the right side of the image as is.

Not sure about the sign in #2 - I think I'd rather see more of it than none of it.