Don't get disheartened. Post irrespective of whether people are commenting or not. All new GFX makers hardly get comments.
First of all, the size. Since you seem to like making smaller wallpapers, I would advise you to make them 800x600. I do not think you have added any render effects which puts me off and the use of light textures isn't very good because they look like spilled milk (no offense lol). It was creative of you to put a picture of the stadium in the background but you should first create a simple background then make the stadium a part of the background. Even then, it shouldn't be on 100% opacity. Sorry I had to be oh so very critical.
Keep them coming!