oOoooo... the mods and sticklers are going to give you a stern posting to about multiple pics...
fwiw, i'll post something about them
1) i'd like it better if the lamp post wasn't in the photo and also if the billows were vertically straight. i love the colors and texture... even the weeds add to it greatly, i just would have taken a few more steps forward to try and not have that lamp on the right side in it.
2) fix the horizon so it's straight, too much sky that doesn't really add anything to the pic, it's a nice pic, but looks more snapshot then carefully composed pic since there doesn't seem to be a strong point of focus. it's sorta nice how the highway leads your eye left to right, but then it takes you to a big pipe on the building... not so good... unless that is your intent. exposure is nice though
3) it's a decent shot, but the hallway is dead center, generally this is regarded as a no-no, generally it's better to have that focal point off center. perhaps more to the left, as to highlight the lines of the pipes and a bit lower point of view. your choice of sides as the left side has a lot of texture and some interesting moss etc., but definitly lower and not centered.
4) the building looks slightly lopsided, i'd straighten that out or the path running across the bottom... the path is somewhat distracting as it's just a horizontal line across the shot. the shot seems to lack a focal point also, it's a building, but so what? unless you're shooting the building for a brochure, it doesn't seem to have anything else interesting about it. the sky is completely blown out on my screen... the whiteness is not only uninteresting, but it's quite distracting, as it throws the color balance of the photo off. in these situations, i generally try to expose for the sky a bit more, and then recover detail in the foreground subjects by fiddling with levels or whatever.
hope that's what you were looking for...