another good way is google image search just type "vader colouring" and you get loads
https://www.google.co.uk/search?hl=en&site=imghp&tbm=isch&source=hp&biw=1790&bih=623&q=vader+colouring&oq=vader+colouring&gs_l=img.3..0i5l3.1285.4240.0.4495.15.15.0.0.0.0.140.852.13j2.15.0...0.0...1ac.1.11.img.PPh697pfa0c