But notice also that Pickwick is hatless. I notice that he's also hatless in Collin Campbell's artwork for the "Story and Song" album:
This is curious because Pickwick has his familiar hat in Marc Davis's original concept art, and Campbell generally follows the Davis artwork closely in his paintings for "Story and Song."
The press photo shows that not long before the August opening they decided Pickwick looked better without a hat, but then they changed their minds and went back to Davis's original costuming. He had his hat back on by the time the HM opened, as this photo shows:
I'm always surprised at how fluid things were, right up to the last minute.