This is a haunting photo. I love the central composition and its symmetry right-to-left. The most intriguing part for me is the color of the eyes. Why are they white? Are they reflecting the light like the reflection in the water or is something else goin on. Either way, the white eyes give the crab a ghostly presence.
Oh! Another Sally Lightfoot. I love the vibrant colours of the crab, but he/she does look a bit sad. The leftover eye stalk sockets are quite haunting.