It doesn't need to be on the AB server, but getting confirmation that you did make them, and didn't scoot off to another server and grab some screenshots...
One way is to use the T key to chat - getting someone else on the server to say that it's your construction - or:
Get someone from AB to witness the creations.
If you have 3 like this, you either found a superb server with no griefers (which we can visit) or they're on yr single player maps (in which case you can download the map using OMEN and we can look at them there).
I myself have no problems with people putting things up from other servers, but some of the others may not like the fact that they're pretty damn good
I'll be googling and searching the minecraft servers over the next few weeks - along with the other judges - to ensure that any and all the competition entries are genuine and not someone else's creations.
I think that, since Munik made the skins, that his are genuine - I haven't seen many people use other skins very often and it is quite original
