One thing you can do is giving it a white outline instead of a white background,I usually do that because I think it's much prettier then a white bg.
Much better :)
I quite like the way you've done the metal bits, very ornate :D
Oh ok. I forgot that everyone is using different themes. I'll add a white background then.
That external AA is absolutely killing the image on a dark bg :(
(Transparency isn't vital, baybe a pink?)
Ooh this is amazingly shaded and realistic!!