Mr. Do's artwork site has always posted art only after extensive digital cleanup. On the one hand, that leads to some great looking art. On the other hand, there's a ton of artwork that's been scanned, but isn't available to the general public. For handhelds, it might make more sense to just put unmodified scans out there as soon as the games are emulated. If someone wants to spend a lot of time improving them (color correcting, removing scratches, etc.), they can always be updated later.