I'm not the section manager for Game Boy games, i evaluate NES and N64 uploads, so in the end it's not my call. But considering you made the box based on pictures and not based on a scan, it should be considered a custom box and we do not accept those, unfortunately.
Don't get me wrong, your box looks nice, but we have to respect the original artwork, because we're on the edge of legal boundaries as it is. If a box is not real accurate to the original (which is the case if you didn't use a scan), we will not add it to our library, i'm sorry.