The composition on most are ok, it is the detail and blown highlights that I have a problem with.
The blown highlights are the areas that are just to white and there is no detail or anything in the area.
Look at Zoo12, great shot, but there is just no detail on the front of him, just white.
Now I have looked over them all again and noticed that you are using matrix metering. I did a little research on the camera, it will do Center Weighted and that is what I would be shooting with.
I am not sure if you have tried it but you may want to go to a negitive number on the Exposure compensation when you are outside.
I do under you were taking these shot is the worst time of the day and it is very had to get good highlights in the harsh sun.
Now the other thing, there just seem to be a general lack of detail for a 7 mp camera, but it may help to get the exposure down.
Remember, NEVER over expose and image, once the data is gone you can never get it back.
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We were all new to photography at one point.
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