The lip color seems a little strange to me, but other than that it looks very nice.
Looks like you figured out the transparency. I think now you should just stick with a black outline rather than the AA'ed one you used for the white background. (Mainly because every PJ user has a different site theme, which will make the background color inconsistant with every viewer)
Ah, I wish I could help. I use photoshop to add transparency though.
I know, I just can't figure out the transparency options in paint.net
I think this would work better with transparency in place of the white background.
Thanks guys, I appreciate the comments!