The DPI has to be a lot higher than what is used in this thread, 300DPI. It's better to start in a lot higher resolution with the same aspect ratio and then crop down later so you don't limit your self. 4.724"x4.724" seems very small to me for an album cover, I'd recommend 1600x1600 which is what I used when I made a cover for my EP
EDIT: You should also be careful with the stocks you use as this is a commercial artwork and any stocks used with out permission could result in a court case, in a worse case scenario that is.