Glank 27...

... you asked for it

#1: it's a beautiful candid but the eye closest to the camera should be in focus. It looks slightly too soft to me and the focus seems to be on the nose. With portraits it is actualyl quite essential that the eye(s) is in focus. Wonderful candid though and should you have photoshop CS3 or 4 than it would be worth trying to smart sharpen it. Just make a selection around the eye > copy it onto a new layer > smart sharpen and try the two settings: motion blur or the other blur setting and see what it does to the eye. Use the amount depends on what you need the image for.
#2 I would crop this even further: try to loose the flower pot on the right hand side and his "privates" and to the left just keep the wheel but loose the black part. I think I know what you want to do with this image but I think you need to loose all the distracting stuff.
#3 is a bit too busy for me. Here again I would crop quite dramatically- perhaps even to portrait format just around the middle bush to get a nice silhouette.
#4 would have need a bit more light trail at least for my taste. A thing to do in the future is to take a black card board. Set your camera to bulb setting (you need a remote control or cable release to use this efficiently) and then inbetween cars just hold the black card over your lens. Also the moment you take the card away from your lens because the next car comes hold the cardboard over the top part of your lens to not blow out the building by too much exposure.
#5 - love it! Crop to the right of the wing of the plane to loose a bit on the right hand side.
Hope this helps?
Stef.