To display staggering orginality.
To preform admireingly well built stuctures.
To find details noone ever found.
To display understanding of structurs weak and strong points.
To be able to take critCIAme and turn it into building ideas.
To be constructive and helpfull.
To be able to take a joke -.-
etc etc..
Its not as much as what you build, its how well you do it. If you make details on only a few certen parts of the build, it might get a lower rate since you were a bit careless, as you should either be very detailed on the overallbuild rather then just a few spots here and there. Also, try not to go for anything with a flat roof, its a dead beat to make it look good.
Thats pretty much that.