1. Start the drawing with the left and right turret. Add the front facade between them as shown. Add the center tower above and finish off with a few flags.
2. Trace the drawing with a black permanent marker.
3. Add details, such as brick and door lines with a crayon. Use a light color and press hard to leave a very waxy line.
4. Paint over all with liquid watercolor paint. My sample is painted with Dick Blick Purple, Fuschia, Green, Blue and Black liquid watercolor paints.