Looks good, but could I make a suggestion? The pixels around Tux' border are too visible and blocky. I applied a slight blur to that part of the image:
http://alexv.freewebpage.org/images/fear_linux.jpg
I'm not sure what it's called in Photoshop, but in the GIMP I used a 5x5 pixel Gaussian Blur. I excluded the section with the text as blurring looked sloppy and made it hard to read.
Have you considered uploading it over at
Gnome-Look or
KDE-Look?