How can you find the value of a signed and numbered piece of art by Marty Bell?

To find the value of a signed and numbered piece of art by Marty Bell, start by researching recent sales of similar works through auction houses, galleries, and online platforms. Check for listings on art valuation websites or consult with an art appraiser who specializes in contemporary or regional artists. Additionally, consider the piece's condition, rarity, and provenance, as these factors can significantly influence its market value.