well it isn't as bad as i thought it would be

just kidding

i don't see anything wrong with it, there are little improvements that can be undertaken, although honestly these will be filtered through experience.
a few pointers:
-the status for the desktop and other screens, seems out of place, it looks okay on the desktop screen, but a little outof place on the rest.
-blurring or fading the desktop background, could help bring out the icons more, and help for visibility issues.
apart from those two issues, the rest seem fine to me

only thing you need to do is make your previews a bit bigger for us to see