I'm new here, but here's a couple of thoughts-
as for a story nothing comes close to Changes in Paradise by Pati Sanders -
http://www.fictionmania.tv/searchdis...ordisplay.html - chocked full of mermaid tf and tg.
keeping an aquatic theme with images - taklayyankovic's aquasapiens are amazing - especially the comic wip that starts here -
http://www.furaffinity.net/view/5511940/