Verwildert
First of all, I agree with what the others have said about composition and lighting. Many of your photos are too dark, over-exposed, or blurry. You need to study your camera and figure out what the settings do. As for composition, try to balance the subjects in the photo. Look at where the subject is standing and try to get the whole thing in the photo for one (several of your photos are cutting the subject out of the frame) and try to create a composition where the eye travels around and is able to move freely. Also, take into consideration what's in the background. My favourite example of this is your "what subject" piece. LOL. Nuff' said.
Here are a few things to look up:
ISO
Focus
White Balance
Aperture
Oh ok ^_^
ISO: a number that determines how sensitive a camera is to light. The lower the number is the more fine-grain a photo is. (They come in 100, 200, 300, 400...) At concerts, indoor events, art galleries, churches, and birthday parties, it is best to use higher ISO number. ((How can I change it for my Coolpix L11?))
Focus: isn't this how clear a subject is in the photo? I can change the focus manually on the SLR cameras I use in school.
White Balance: is this the color temperature of the light? Many times auto-white balance gives the wrong color temperature if there is too much of one color.
Aperture: is the device that determines how much light is entered into the camera. It is measured in F-Stop.
I really like this ^_^ Give me more homework @_@