Started to fill in the green back fins/spikes. The random blob colours at the top are the base colours I've used in this so far. Good to have a note of them somewhere in case I need to use them again later on.
I've made the fin layer more transparent so that you can see a bit of the dragons body underneath them. I still need to add more shading to the fins, they looks a little bit too flat still.
After a bit more shading I decided to keep the transparency of the fins at 100%. It just looked better and I can always change it later if I want.