Posted out of order, because I'm still working on the reference. (which will be linked once completed)

Possible Head Ornaments and coloration examples. As long as you keep the key features(the pointed nose, the ear frill, dewlap, and jaw spikes; You can have a lot of freedom in the design of your Wyverex.

The max colors for Wyverexes is 3. As you can see, you can play with gradients to really get different looks. I'm still working out if patterns can be on these, but I'll let you know as I get the species reference finished.