I like the scan you choose, thats what
I first noticed when I looked through your gallery.

Hmmm, I think it's way too dark, the scan
blends in with the black so it's hard
to determine the scan from the bg.

Like if the bg is eating the scan up almost.
The text I feel is too big and takes alot of
focus away from the scan.

The green parts are somewhat out of place...
and it makes the wallpaper look plain and unattracted
well the bright color of the green gives it attention
but it's not a good color for the scan...maybe if they were leaves :)

But it's your first, so I'll go check your most recent :D
nice job for your first though, much better then my first lol :3