Normally if it is about CC you should plan on submitting one image. If 6 images, them submit in 6 different threads, like maybe one a day. This of course is my opinion, unless of course your comparing 2 similar images to one another...Now in saying that I will offer my opinions...
1) I really don't know what to make of it. It is too small to give accurate CC. Right off the bat, I would say it is about a 1/2 stop underexposed. As a result, it looks very soft and there is no punch to it. The composition is good however....
2) If you increase the contrast, you will have an image that pops. The cut off tire bothers me, but that is nit picking. Overall I like the image..
3)The third one does not work at all. The chpped hand kills the image. If you cropped out the guy on the left and cropped to about the fellows right forearm, you might have something, but then the guy in back ground is a distraction...
4) is ok, but lacks pop. Try a 40% smart sharpen and increase the contrast a tad.
5) The mushroom is boring. Far to much back ground. If you cut away 1/2 the back ground you will have a good image..
6)This is a great shot, the best of the bunch. No CC to offer..
Keep shooting!