nice looks good to me but i'm not so good of a judge considering i just started doing rendering too. well good job keep it up.
If you're desperate you could just cut the white off, or select everything else, select/modify/expand then expand however much works and hit delete. I'll bet there's a better way that I'm too lazy to do though, like the defringe thing. Oh yeah, and good job ^_^ <-- I always forget to say what I think, lol
