A pawn shop doesn't usually give a proper appraisal for art work unless it has an art expert on staff. A company or professional that specializes in appraising, buying and selling art is more likely to provide a more accurate estimate.
Online art dealers such as Appraise Art offer free estimates of artwork and provide owners the option to sell pieces through either consignment, auction, or posting the item online. It is also helpful to get a second opinion from another art professional to verify the value of the artwork. Hargrove is one of America's best-selling artists, and there are many knowledgeable dealers who can provide accurate appraisals of his paintings.