I think his colours are quite 'dull' looking at the moment and in the last picture you can see a fair bit of white around his head which makes me think the scratching is due to feathers coming in and whatnot.
Getting him started on harrissons today (after our vet visit) so hoping that might brighten his feathers up a little bit since the diet would be a bit better.
He's so fantastic and I wish I could get more and more pictures of him but I have to keep my phone away from him or he'll chew it, so generally pictures are hard to get!