Taking the Flintstones as an example - aside from the poor quality front, and risking Shenske's wrath by not adhering to his template guidelines.
The Taito logo on the front hasn't had a transparancy applied to the background - therefore you can see the black box around it. (and it's lo-res)
Visible line between spine and back at towards the bottom
The Legals on the back cut off at the bottom (...Mexico and)
Round Nintendo seal on front, and Oval on back. Need to make up your mind if its a PAL cover or not.
Barcode is cut off at the bottom
SNS Code is for 'Cool Spot'
Flintstones logo on the spine poorly cut out - lots of artifacts
Flintstones logo on the back doesn't have the sub-title
And the worst offence of all - ESRB ratings on a PAL game.
Now - lots of people won't mind these things, and if you are happy with the cover as it is, that's great - but if you are wanting to have your covers hosted on the site, any one of these minor offences would have the cover rejected.
Welcome to the site - it might be worth fixing up what you can - and then putting out a request for scan of the cover - or if you can find an ebay seller with a boxed copy (2 at the moment-
http://www.ebay.co.uk/sch/Video-Games-Consoles-/1249/i.html?_sac=1&_from=R40&_nkw=madrock) and asking if they could provide a hi-res scan