Sulphur Crested Cockatoo

This is my first bird Blip.  Not great, I know, but I really wanted to have a go. They were noisily massed on our almost bare willow tree this afternoon.  They were so high up - 25 metres ( 80ft) or so.  So you can see my problem.  I know you can't see the bright yellow crest on this one, but I was more focussed on some feather definition so had to go with the better of those.
I will get another one, with crest, with well defined feathers, with blue sky
(lousy day didn't help). I promise. Extra is just to give you a glimpse of how they were massed over the top of the tree - one hundred or so.