Hmmm - I don't remember these two, so my apologies if I rejected them and did not post the details. I guess I could have credited them to someone elsein the dupes thread.
The most common reason that scans don't make it (other than simply poor scans) is that of size.
I notice that of the two you have upped more recently, one of them - Bratz - is 4320x2901. This has been rejected. A standard case cover that is not 3240x2175 (or very close to it) will not make it on to the site.
Your other recent cover - Dave Hughes Live - has been accepted, but it was, I must say, a close thing. The cover shows a few spots of dust and some signs of a dirty scanner bed - any worse and it too would have been rejected.
I hope that helps - and please keep the covers coming!

I will fix the Bratz cover and clean the scanner. I think I'm just about due for a new scanner anyway, this one has been around quite a while. When I get it, i will rescan the ones I've posted and get some nicer scans uploaded (at the correct size and resolution) .... Thanks for the quick reply and good advice