the picture of the flower should have been cropped the other way.. the way its leaning makes your eye go to the left.. you look to the left and it feels cut off.
Its also under exposed and could use some contrast... Pretty easy fix in photoshop
The clock also seems to be a bit under exposed.
The shot of the Vdub was mid afternoon? I dont see how.. looks like a long exposure at night. Might wanna watch for what objects are around, cause there is a tree growing from its trunk.. Heh.
I don't care much for the last shot of the dragon fly cause of how hard it is to spot. But the first one is alright but the picture still seems a bit busy, but.. much better than the last one.
Anyways.. Keep it up and you will improve.