Topsell's dragons have very interesting wings: they aren't quite bird wings and they aren't quite bat wings. They have skin membranes supported on ribs, but the ribs don't look like finger bones as is the case with a bat.
|Image from here.|
Instead, the wings seem to be supported by curved spikes of bone or cartilage. But notice how the overall shape of the wing is based on a bird's wing, and scales have been drawn along the leading edge of the wing to imitate feathers. I've used the same approach in making the wings for my project.
I've put a thin membrane between long curved spines set at intervals along the wing, and added scaly texture to the top edge. I think this might look quite good when it's finished.