2020 W Proof Jefferson Nickel Color

Reverse:

Strange and not ideal to have that kind of toning on a new coin

It can, yes. Mine had a small but noticeable dark spot on it near TJ's right eye, but it wasn't too distracting and I didn't get it from the Mint, so I'm keeping it.

picture is through the bag which is why it won't focus, I see what you are talking about, I feel like it's from grease. not sure if pure acetone would remove it.

if it's a 2020 set, you could return it and just buy another after. there's plenty of time, and not have to bother messing with it. If you remove it from the plastic, it's gonna be a problem for the mint I think for a return on not being happy with the quality.

I can make it out though, to the left of jeffersons head on the obverse, and above Monticello in the Pluribus as well as in United.

as far as better pictures you can try less light and backing off the magnification some. it may focus better.

I think it's grease from the strike and poor quality control. probably cleans right up, but if it doesn't you might be stuck with it so better to make the return I think and order another set.