your limit to 1000. If you find the other fairy fountain or fairy island, then she'll upgrade it to 5000. As for the coloured pictures, theres a sidequest you have to do that I'm not really sure how to explain, so you can check out how to do that over here: http://www.ign.com/wikis/the-legend-of-zelda-wind-waker/Picto_Box_Quest