Not bad at all for a beginner. At least i would say that you understand composition.
Now switching the topic, and i may be wrong but i think that you have some dust on your sensor. It's pretty obvious on your two first shots.
Yeah I saw the dust or something on the first 2 also. What is the best way to clean that or get it taken care of so it does not show up in future shots?
You can either get it cleaned at a camera shop or do it yourself. They sell some cleaning kits. I have never done it myself, so I can't really help you much...