LOL, follow me young jedi, I will guide you to see the light! LOL
Anyway, basically, there are a couple ways to do it, take your album cover to a photocopy place, and get a GOOD color copy made on photo paper, then follow the material finish tutorial basically. The only bad side is, if it is a CD cover, you will be enlarging so much you will lose some quality, if it's an LP cover, you will be better.
Secondly, you can go to a sign shop, there are a few machines called the Gerber Edge (and many similar ones) that allow full color printing on vinyl, you can get your graphic applied to that, and then just adhere the vinyl to your guitar. If you end up not liking it in a couple months, you can take it off easily with a hair drier. You can also clear over it, but finding a paint that will bond well to the vinyl is tricky somethings. Laquers don't work well, usually you need a 2 part paint which are typically cyanide based, you need a fresh air spray mask and proper booth to safely spray those.
Yoda
p.s., ironically, I just got an email from another customer who in the end said, "help me obi wan kenobe, you're my only hope" LOL
now if yoda could only use the force to get the damn paint reps to give me the info on the paint you want..........