@Intan – if I was going to paint an image on a cake I would use the technique of piping the outline and using a flat brush to drawn the icing line inwards. It is called brush embroidery in UK. But this technique will give a nice outline to start with. I would also find an excellent pic of a peacock from the internet to copy. Build up the areas where edges are required and then draw the coloured icing inwards. I would just look at the pic and see what colours are in the peacock and make piping icing in about five of the most obvious colours. Use a scriber or sharp point to trace the outline onto the cake. You can always paint with a paint brush over the top of the brush embroidery. Hope that helps…..:) Kx PS this is assuming that you are using fondant to cover the cake.