Here come some shots of 2nd winter birds from above.
Pale bird with faint pale ghostly pattern on the primaries and on the tail - seeing these ghostly patterns is very much dependent on the light and the angle in which the bird is seen. This is probably the palest ssp. kumlieni possible to identify. And when watching 50 or 100 Iceland Gulls in a flock many of these pale birds just go by as glaucoides.
Less pale than the bird above but it has the same less patterns on the primaries and the tail. Again I'd say a pale kumlieni.
Dark Kumien's Gull with very obvious dark markings on the primaries and the tail. The ghost is gone and these birds are easy to spot even when you have a flock of 100 Iceland Gulls.
Another dark brownish and heavy Kumlien's Gull with obvious dark pattern on the primaries.
Pale bird with a dark tail but no visible ghostly markings on the primaries. Furthermore the iris is pale. I would call this one a glaucoides.
Pale bird without any markings on the primaries. Again a glaucoides that is a bit more advanced than the bird above.
A bird with dark iris, rather dark tail and very faint markings on the primaries. I wouldn't label this bird as kumlieni or glaucoides - I can't be sure which one it is.
Almost like the bird above, but the iris is darker and the markings on the primaries is just a little more visible - thus a kumlieni.
Pale bird without obvious dark tail. But it looks like there are some very ghostly markings on the primaries. But it is less advanced than most other second winter birds now, so I don't think the markings are a sign of kumlieni.
A medium dark bird with rather dark tail and faint ghostly patterns on the primaries. But the iris is pale. But in spite of this the primaries should indicate ssp. kumlieni.
It is not easy to get an accurate number of Kumlien's Gulls with so many Iceland Gulls present at once and the differences being so subtle.