How to start a painting working from a blank canvas. I suggested they could start by changing the colour of the canvas. That will give you feel for how the paint goes on. Think about whether you want the canvas upright (portrait) lf on its side (landscape). You could do a gradient of colour or greys so it’s lighter towards the top or one side. Try and think of a simple subject to start. How are your drawing skills and do you want realism or an abstract subject. Most of all – enjoy!