Dragon Scales?

So I’ve been working on a Dragon. And I was wondering what the best way to add scales would be. I made a normal map of a few scales and also a bump map. So far only the bump map has worked well. But It only covers part of the Head and not all of it. If you could help that would be greatly appriciated.

I know it still needs lots of work.

Here’s the head


and here’s the bump map I made.