Nice looking pano. My guess is you replaced the sky since the sun angle on the clouds is close but not quite matching the sun angle on the peaks. Very close to a match and if you hadn't clued me in to be looking I could have missed the overlay. Is this Luminar 4?
Thanks Bart, I'm prejudiced about this shot since I've climbed all these mountains and looking at this brings back good memories. About 10 years ago I did the first winter ascent of the east face of Sperry, which is the steep wall facing the camera of the central peak. Our route followed the gully just right of center, up to the skyline ridge and then to the summit. The last bit being the hardest in steep deep snow that we were swimming up in places.