I would definitely love to clean it up but unfortunately I am no good at photo shop as you might be able to tell from my few SNES covers that I uploaded in the past. I would like to upload raw scans of the SNES covers that I have and have them match the vertical template by Shenske (now that guy can create covers!

).
If anyone here wants to give a crack at it, go for it.
My method of creating GBA covers is just scanning the box at 300dpi (which was crushed pretty bad in shipping) and cropping it to fit the original GB template that was uploaded quite a while back (only had spines for GBA, GB, GBA and GBAV). I only use what the retail box includes as I personally prefer the actual art that was supplied.
I uploaded this template mostly as a favor for the OP and to be honest it looks fine to me when it is actually printed out (I use a heavy duty Canon Laser printer at work).
Let me know if you guys would prefer to have me just upload Raw Scans as I have a crap load of GBA and SNES boxes that should be added.