Why were my pictures rejected?

Picture by picture, without a deeper analyzis, just based on the previews:

1. is clearly out of focus... the hand is missing detail and colours are washed out... if the plug is the subject, it should clearly be completly in the picture... the model number may cause an ip problem.
2. why is there a ballpoint in the picture? 
3. how do you look at that picture? You have a really strange point of view. What does it show? Composition: why having 2 shoes in the view? The logo on the car and the license plate are ip problems.
4. This one is very probably underexposed, may be the contrast is also to high. Composition is bad. If you take such pictures make at least sure that your main subject (the white van?) is completely in view and that all parts of the car are correctly exposed. The tires do not show any detail. If the plastic bottle is the subject, make sure that it is bigger in view. The car logo and licensing plate may be a problem.
5. No idea what that picture shows. Bad composition and point of view! Also here: What do you want to show? "Artwork" may be ip-protected.
6. What does that represent? Why is that mess around? The reflection from the flash/light source IS a technical error. The upper left corner is to dark.

All in all: If the moderator would not have refused your pictures based on technical errors, he could also have chosen ip violation or aesthetic or commercial appeal. Stock pictures need to be carefully composed, well exposed and framed and there should be a clear subject. Taking a camera to make random pictures of random objects rarely leads to usable stuff. Even if I take pictures of "mess", it's carefully arranged, so that the subject is clear and usable. rarely I have a random picture of random objects getting into stock...

Hello,

The composition isn't good.  What use could these images be used for? What do they show? Also, there may be IP issues regarding some of the images.