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While I think that there is a very
good chance that the second bird is a Herring (or Vega) gull, the light in this
photo makes me wonder if this is not a Slaty-backed Gull which is more abundant
in winter in coastal Japan. Then again, if the primaries truly are paler (and
not a light trick) then there's an outside chance it's a Glaucous-winged Gull
where the primaries are truly grey rather than black as in the two prior
species. The Glaucous-winged is a northern Japan visitor during winter so not
outside possibility that would be around Tokyo. All have similar streaking and
spots on bill so would take someone who is very familiar with all 3 to
distinguish in my opinion.
Cheers
Shaun
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