Of course there are artifacts, it’s a digital representation of a film image.
Inconsistent pixelation around those edges only.
I’m not referring to the entire composition or film to digital transformation.
I am a photographer and use Photoshop extensively.
It is possible because much of this capture is rather soft focused that the photograher may have attempted to sharpen the edges of the eagle only for more visual impact and that would result in some pixels looking different from the surrounding ones.
I also scan film photo prints and re-process them in Photoshop and you typically will not find one single element of a composition being more edge pixilated than the other elements, without it having been treated.
Sorry, but its just my opinion. And you know what they say about those!
:)