This guy was standing on a low level bridge, during a heavy downpour. I stopped my car next to him and after the rained had stopped, I took this image.
Canon 20D
100-400 L IS USM @ 400mm
1/1250
F/10
ISO 400
Very sharp! Good detail. The standing rainwater (?) makes a nice background. Nice capture and composition. I'm not sure it fits macro or flora but what the heck! :)
Stuart, I love the crab and the water but the entire scene seemed a little light in the contrast department to me. I did a slight levels adjustment and an "S" curve and came up with this. It might be too dark for what you originally "saw" but thought it was worth presenting as it seems to make the colors in the water and the crab "pop" just a bit more.