This parrotfish seems to be peeking through a branch of soft coral. Parrotfish have sturdy teeth and jaws which remind one of a parrot. They bite pieces of coral to exhume algae within the coral. The ground up coral is released as sand - up to a ton in the life of a parrotfish. Older females often change sex, thus changing color to that of the darker male. See also Parrotfish Smiling.
This image is available to 9 x 14 inches.