These portraits are rendered on acid free paper and are coated with a spray fixative.
Colored pencil is no more fragile than watercolor or oil, and it will be beautiful for years if proper care is taken to preserve the piece.
I recommend museum quality framing materials to protect from dust and harmful light rays. Never hang a piece where it will be exposed to direct sunlight or excess moisture. Inside walls are usually best.
The folks at The Great Frame Up can assist you in choosing quality framing materials.

The Great Frame Up

770-716-6466  •  Fayetteville Towne Center  www.fayetteville.thegreatframeup.com