Thoughts from a second year CBJ.
I judged 11 or 12 comps in 2008.
I've yet to compete.
Judging garnish, I look at:
Is it nicely done? Is it neat?
Does the green favorably complement the meat?
Is it legal?
For me, that is the end of the visual influence.
Think about it, in the next step, each judge picks a piece from the passing boxes. In doing so, that presentation is being dismantled. By the time all of the entries are on my judging "plate" that first impression association has vanished. Hence, in my experience, at the judges' table, appearance has zero influence on taste, texture.