This sketch is of a juvenile angel fish in the Bay of Ixtapa. We spent many happy hours snorkelling here. The fish are plentiful and the water is calm and warm. The adult versions of these fish are bright blue.
I coloured this with the new Inktense water-colour pencils. These pencils are buttery soft and dissolve very easily with the addition of water. Water makes the colours even more intense and vibrant. I like these pencils a lot. The down side to this brand is that they are so soft that they don't hold a point so it is hard to get a sharp, thin line. But the strong colours make up for that.
The paper is Bee paper's Co-mo sketchbook. I like the texture of it. It is thin, only 80 lb so won't take a wash of colour without wrinkling badly. But as a take-along sketchbook, it's the perfect weight and size. I took the photo with the iPhone in natural light. No shadows this time, except where the paper had crinkled a bit.