I think a similar diorama with a comedic rather than graphic paint job / tone might be perfectly fine actually.
I only added the blood because another Blood Bowler said it would look better with it, indeed one of the comments I got at last year's NAFC was that it was not gruesome enough and needed more blood! I suspect with so many opinions I ain't going to be able to please all of the people all of the time. I would be happy to remove the blood if this made it acceptable / eligible for the Duel Competition as a lot of time, money and effort has gone into this diorama and I would be disappointed if I was not allowed to enter it in the competition.
After last year where the winning entry won despite not abiding by the rules of the competition my inner child is amused at the lengths I am going to win approval for my entry to be allowed this year
With the blood removed hopefully it will now be seen in the "comedic" fashion that was always intended: