I think if you had a nice dark feeling to it, it would have been good but it's just to light for the render you chose.
This. And you cant have big white spots of nothing next to your render. Just keep making things, experiment, learn some techniques from tuts. keep trying
about the light source...you put it left to the render...it would be better if it was at the right side...cause the lighting on the render it from right if you put where i told you the light source ...then make some parts darker...thats all ______________________________
It could have been better with a dark background instead of blue. Keep trying though, and look at tuts.