Coloring bitmap crag
Stone, sand, or just a mountain of garbage, it does not matter if you are shown the contours for painting or just a picture. A couple of strokes and the mountains of compost can be faceted diamonds. All depends on the skill of the artist and his imagination. What we see is to depend increasingly on our way of thinking. The picture is not very good, but for some reason would not, because the mountains are different. Paint, stretch, twist, may be just right.
Coloring in a raster (pixel) format. If you use a graphics editor such as adobe Photoshop, then using the fill can easily paint a picture. Outlines for coloring perfect to spend some time coloring on the computer. For children this can be fun and not an obsessive study of the work in the graphic editors, and knowledge of the world in different shades and colors.
Coloring can be printed, and then paint.