Most definitely painted, given the clear line of demarcation, and reflective differences. A little bit of research turned up that 95th BG B-17s has stripes added to their nose sections around July '44. Specifically, planes from the 334th, of which "Worrybird" was assigned had a yellow stripe. This makes sense, given that the color looks like a brighter hue... minding that many colors look widely different in black and white, depending on a number of unknown factors. Regardless, photos of other 95th BG B-17s online also show red, blue and green, which matches this reference:
https://95thbg.com/cms/2019/12/6/camouflage-and-markings
Scroll down to "July 1944" for the correct notes.
1 attached image. Click to enlarge.
