I thought it might be interesting to post pics of a painting stage by stage...
I decided to paint a landscape based on Embsay crag, near Skipton in Yorkshire. I grew up in Embsay and used to spend many hours exploring the moors, so the crag has a special meaning to me.
I began by taking a blank canvas and spraying onto it some matt acrylic under-painting:
I use any aerosol lying around in the shed for this - I have used red oxide and black in the past, just as long it is acrylic-based and matt (I use 'Plastikote' products - no connection).