Also, add some good art-style. You can't go wrong with that.

If it's possible and it does not bother staff to take their time to reply to you, try asking them. I am not sure if they keep a record of the time a certain file was uploaded to their servers, but if not then don't worry about the dates. You should also write some history about graal (Time of Creation, Credit to Developers, Stefan to Eurocenter to Toonslab, Lawsuits, etc)