Now you are making a dragon, but not a dragon, based on concept art.
When you want clients and invest now so many hours, why not searching a sketch on Deviantart and do a model, based on that, to show your sketchbased skills?
Your clients will not come and tell you to model a dragon of your choice. They like to see how you do sketchbased models, not models based of dazillion fotos and you can dice out, what they get in the end.
It feels more then a showreel to me, then searching for clients.