I waited for the sun to go down to get this, and set up the tripod. Using a cable release and settings: 20mm, 50 ISO, 25 seconds, F:11; I used a hand held flash and hit the tree roots about 5 times to bring them out of hiding. I was trying to get a consistent light without shadows and emphasise the roots of these trees. Also wanted a long exposure to smooth out the water. Click to enlarge, C&C welcome.