First step, Simplify it to just the one piece.
Next, mark out the design in pencil.
Paint in the shadows to give a dimensional effect.
For this I used neat paint, mixed with textile medium (or in this case Aloe Vera gel, because at that time I did not possess any textile medium).
The colour was obtained by mixing a small bit of black with the bird house colour.
Adding the medium/gel allows you to work slowly and accurately with the paint and to build up the layers of colour.
To quote a famous Meerkat "Simples"......apologies to non U.K. readers who won't know what I am referring to....but if you are curious look here.