Started this new portrait today, this is just the underpainting so it's likely to change quite a lot (needs to!). I have only used the normal two colours for this. Have you noticed something on this page, right under this post? There are some buttons that you can click on and it likes it on my facebook page or you can tweet it from here too. Only noticed them yesterday and decided to try it out myself. When I went on to my facebook profile there was the post (I quickly deleted it though in case anyone thought I was bigging up myself too much). Click on it if you want to though, I'd love that.