I think that in most of these contests, and certainly from the next round onwards, there are no 'wrong' selections. Deciding who to pick comes down to some really marginal hairs-breath differences because you've got to pick someone. We're tremendously lucky to be able to enjoy such phenomenal artwork down the years.
I think I'm going to start doing imaginary art-swaps for the artists greatest works to help decide: Carlos on Nemesis, Kev O'Neill on Slaine, McMahon on the Apocalypse War, that kind of thing.