Iām getting nervous, as I see some brown in Archieās chest/stomach.
Need a pic, and background, age, diet, previous history, any sunshine ( has a great effect on feathers) as long as you stay in light shade and stay with bird in secure cage.
So it looks like he is over preening, and barbers feathers a little bit.
Make sure plenty if easy to shred stuff. Make sure plenty of baths, and veggies