Octopus
I had a very productive series of dive in which I saw octopi in the open many times. After more than one hundred dives the best I had before was the mere glimpse of a body or tentacle. What I was seeing was very special. 
National Geographic will only publish one shot. But I have no restriction. This series was at the end of another dive and I was on low battery power warning. 
Every thing held together. We chased this guy down and kept following him as he flowed over the coral. You can see multiple camouflage changes. 
The natural color is a chocolate brown. The color changes are accompanied by texture changes within seconds. I wondered why he didn’t squirt ink. Meanwhile he was accommodating and let me get images of all his changes.
All of the color changes, out in the open, a good view, and excellent light – as they say – priceless. Glad I didn’t blow this series. It’s why you practice. For this moment everything worked.
photobackstory 