Thanks all for your feedback, which was invaluable in making up my mind.
In the end I went for "Standing Proud", "Photographers at Work" and "A Hand Held Record of a Photographers Lunacy". I would have gone with "Looking for Lunch" but on closer inspection at full screen resolution a fair bit of 'noise' was evident from slightly over cropping the image. This would have been magnified too much when projected onto the big screen so I left it out.
Taking Jan's comments on board, I did go back to the moon and played about a bit with the contrasts and I'm fairly pleased with the end result. Whether the judge on Tuesday is, is another matter.