Coloring book can inspire imaginary and creativity of children. However, with the rapid development of digital devices and internet, traditional coloring book tends to be not attractive for children any more. Thus, we propose an idea of applying augmented reality technology to traditional coloring book. After children finish coloring characters in the printed coloring book, they can inspect their work using a mobile device. The drawing is detected and tracked so that the video stream is augmented with a 3D character textured according to their coloring. This is possible thanks to several novel technical contributions. We present a texture process that generates texture map for 3D augmented reality character from 2D colored drawing using a lookup map. Considering the movement of the mobile device and drawing, we give an efficient method to track the drawing surface.