Art Gallery Participation

I've been invited to display one of my hand tone and hand tinted black and white photos at the local art gallery. This is a first for me. I've not explored the art world, but was recommended for membership by someone who saw my work. Any hand tinting that I've done has been for gifts, album covers for weddings, seniors or children. I'm comfortable pricing my photography but not my "art". I've prepared the necessary documention to accompany my selection (Certificate of Authenticity, my artist bio and my business card). But I have to provide them with a sale price. Any suggestions?