Mark Styling has done a series of profiles of B-17s.
For what it is worth, this is his take on some 398th Planes. You can click on any image to get a close-up of the nose.
Any comments from the experts here?
This link starts on the 5th page of the images:
https://www.markstyling.com/1ad_b17s5.htm
Plane number 42 is from January 1945
Plane number 46 is from August 1944
Plane number 47 is from December 1944
This links to Mark's 8th page of B-17 images. Plane number 77 is from the 398th, dated 1945.
https://www.markstyling.com/1ad_b17s8.htm