For the past several years I've been experimenting with painting images over a thick combed texture. Lately I've been really exploring this over a series of canvases.
First I prep my canvas by taking a gel medium and combing the surface to create a loose pattern that sweeps somewhat evenly across the plain.
Once it is dried I start laying out my image. It can be quite difficult to get accurate lines and edges when you are painting over such a bumpy surface.
When the painting is nearing completion, I do a series of washes over the image. The thin paint settles into the grooves and this adds a whole other dimension to the piece.