This is a juvenile bald eagle (Haliaeetus leucocephalus) I photographed in Alaska using my iPhone 13 Pro and the built in 77mm lens.

I can get pretty close to eagles in Alaska. I was about 10 feet away and in this case he landed next to me and stayed.

Even that close, I needed a 50% crop and then decided to run the RAW file thru Topaz Gigapixel to make it larger (https://bit.ly/topazgigapixel - use code METHODS to save 15%). I did some additional post work in Luminar NEO. Then I cleaned up the noise with Topaz DeNoise AI (https://bit.ly/topazdenoisefilter use code METHODS to save 15%) and I think it came out pretty well.

I did spend about 10 minutes overall working on this image which for me, is a very long time. I prefer 30 second post workflows but you do have to work a little harder when you're dealing with a smaller sensor.

NOTE: As you can see in the BTS shot - (courtesy of Malcolmn Ramsey) the background is natural. It's just a bunch of tall grasses but because of the rule I always remind folks of - i.e., as subject distance to camera distance DECREASES, so does depth-of-field, the grasses just sort of disappear. You can get nice bokeh from an iPhone; especially the built-in telephoto lens, you just have to be able to get close to your subject and have at least six feet between them and the background, I had about 20 feet between the background and the bird here. (You may be able to see the Small Rig cage handle in the photo. The tripod in front of me has a Panasonic GH6 mounted on it. I am hand-holding this shot.)

About the lack of a white head... This is a juvenile. Bald eagles' heads don't turn white until they are about 5 yrs old.