I think it might be just a heavy depth of field blur. Like you get the camera super close and focus on a tiny part of the model and lower the F-Stop a lot and the material being glass, the refraction can make all those pretty light bending swirls and smudges. I’m guessing of course, that would have to be put to the test. Also much of the time you’d think it’s an in-camera and scene effect, as if you just hit render and that came out, but a lot lot lot of times it’s super heave post production and filters in Photoshop.
