After saying I was going to paint a squash I ended up painting this apple! It just appealed to me as it was sitting there in the fruit bowl! Instead of a burnt sienna wipeout underpainting, I painted the image loosely in the actual colours and values and then 'tonked' it! This means that I placed a piece of newspaper over the whole image and gently rubbed all over the painting, taking all the excess paint off. You can then start working straight away, without having to let the image dry. I meant to take a photo of this stage, but I forgot as I got engrossed with painting.
I'm going to let it dry completely now and then go over with some glazes.