I began by drawing the three fish and then carefully painting in a rich olive green/ variable background. I wanted a gradient of colour across the painting to give a sense of movement and add interest.
Once I'd painted the fish (using mostly thin washes and layers,) the green looked too contrasting - too different from the fish colours and I realised it needed warming up.
I washed over the green with a magenta and the result was this interesting mix of browns and an appealing 'deep-sea' atmosphere.
One fish, two fish, red fish, blue fish...