here is my step by step of the Kohlmeise.
I use for this painting self cutted stencils (frisket film) and the stencils from Airsick stencils.
I start with the background in a light blue, I cover the bird and the bough before.
Then I cover the bird and spray the bough. Details with different erasers. After this
I cut from the reference picture the bird out and cut out some feathers.
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Little Bird "Kohlmeise"