The Official Rules refer to "Judging Criteria" here:
4. HOW TO WIN;
The Judges will evaluate the Entries based on creativity, quality, adherence to the contest rules, and overall interpretation of the contest theme (the “Judging Criteria”) and the Judges selections shall be final.
However, I haven't been able to find any clear information on these guidelines anywhere other than this:
To participate, you must craft a heavy metal-themed ESO/Gates of Oblivion poster that includes a screenshot element from the game itself. The screenshot element can be as large or small a part of your design as you like, but it must be included in some way (for example, it could be part of the background, a paint-over, or cut outs).
Entries will be judged by the teams at ZeniMax Online Studios, Bethesda Softworks, and heavy metal band Trivium with emphasis on creativity, quality, adherence to the contest rules, and interpretation of the contest theme.
@ZOS_GinaBruno I really enjoyed Trivium’s “The Phalanx” song and video! My favorite metal songs have a combination of hard and melodic and feel epic! I wonder whether Matt Heafy would consider doing a cover of “The Burning of Senchal”? So many beautiful songs in ESO but that one gave me chills first time I heard it. I’d looove to hear a metal version if the band were so inspired.
So they can make a guitar in real life, but where are my musical instrument furniture items!!! I want the harps, the lutes, and the various other exotic instruments in game so I can put them in my house. We been asking for this from the start!