mmm after having another think about effects the banner needs ive decided that the trolls skin needs to be lightened up somewhat. I was a little worried about trying this but its actually alot like painting layers onto a miniature. I also decided that the troll needed a bit of color for his eye and needed to have some rocky lumps added to his arm.
Im happy with the Banner now and will leave it like this. Now to think about how to do the blog background!