Get a professional appraisal of the art you wish to sell. Art appraisal houses can be found in most large cities. Different houses often specialize in particular artists, so check with the appraisal house to make sure it routinely handles Fazzino's work. The appraisal will take into account both the intrinsic value and the condition of the work you wish to sell. You will likely have to take or ship the piece to the appraiser to get the best result.
Contact the Fazzino collector club after you have an appraisal in hand. This will give you a list of preferred galleries that handle Fazzino's work. Contact those galleries, starting with those closest to you, to see if they are interested in either purchasing the work from you or selling it on consignment for you.
Contact an art brokerage firm near you. Brokerage firms can be found in most major cities, but also tend to specialize in particular artists. Choose one that has experience with pieces by Fazzino. They play the role of middle man and take a percentage of the final selling price. A brokerage firm will set a minimum price which, if offered, you agree to sell at or pay them the same fee if you change your mind. An art brokerage house may also hold or recommend auctions which can highlight the work you want to sell.
Offer your piece on an Internet auction site, such as eBay. You cast a much wider net but over a much less focused target market. Have clearly in mind the minimum amount you will accept.