[JollyElm]

Do you intend on selling it?

The 'PD' is often the most mysterious qualifier given, and usually leaves collectors asking, "WTF exactly is the print defect here???!!" (I have quite a few in that category), but in this case it is plainly obvious that The Mick was out partying with Santa and Rudolph when the photo was taken.

Here's the issue as I see it, so do with it what you will. Most collectors don't seem to want cards with qualifiers, so the obvious advice would be to resubmit it and request no qualifiers. If the rule of thumb holds true in this case, it would come back as a PSA 5 (2 grades lower than the original 7 because of the defect). So now you have to consider this. Whether or not the card is a PSA 7 PD or a straight PSA 5, the snow flurries are unmistakable. Every potential buyer will see the 'problem,' and some will be turned off by it. I imagine that if it was in a straight 5 holder, some collectors thinking of making an offer on it will consider it a 5 with a lot of snow, so in their minds (unfortunately) it will actually be lowered to a PSA 3 (2 grades lower because of the snow). Know what I mean? If it was still in a PSA 7 PD holder (that clearly acknowledges the snow), however, then the lowest 'it could' go value-wise in their minds is down two grades to a PSA 5. So according to this scenario only, you would be better off leaving it as is.

Edited to add: you can also consider just having it reholdered in a new case. That's another option.