I know the feeling you went through, sometimes all you can do is stop, I think the brain works through the problem until all.of a sudden you know what to do and 'oh it's finished, when did that happen'.
As for the beast I'd suggest looking at the work of fantasy artists like Boris Vellajo, Julie Bell, Chris Achelios and many others. I learnt a lot studying these artists about use of colour and light, there are enough beasts and dragons in their work to help I'm sure.
He really is looking good with the repaint, take your time it would be a shame to spoil it now.
Cheers Simon