This detail is similar to using oil, but without the old, heavy look. A drybrush water color is the new Master's media. This media is very good for a child's portrait.
Pastels give a very soft, full, three dimensional look.
This media will last a long time when matted and framed correctly. The pencil can either be the final product, or it will act as the preliminary step for a drybrush watercolor or pastel. This allows the client to view the work before being completed in color.