A computer generated paper for the fish shape. Translating the horizontal lines, the shadowy feel and variable light and texture.
Top translation: going for the shadowy light with trapping 'bits' under a strongly coloured sheer - needed a few more darker additions really, but still a nice fish.
Middle: used a cheap nylon curtaining with sheer panels for the light and shade and it had strong horizontal lines, changed the colour as I need more in the red orange range.
Bottom: tried some free machining in a dark thread with a contrasting head and a flirty tail. used markal on top to make it more colourful but its not either a great fish or a good translation.