Well, what can i say... It looks like a first time tag.

I can say a few tips:
Google 'rule of thirds'
Dont make an outline around your render.
Try to avoid 1-9 px borders, make them +10px or leave them out completely. Some might disagree but this is just my opinion
And the best tip we can say to you at this point is, Read tutorials, make sigs, read tutorials.... Read alot of tutorials.