Can't tell much from these photos, but the slightly darker back is apparent. If you squint you can convince yourself that there is no ring on the bill in the photo showing the head.
The Common Gull (European and Asian subspecies; see below) or Mew Gull (North American subspecies) Larus canus is a medium-sized gull which breeds in northern Asia, northern Europe and northwestern North America. It migrates further south in winter. Its name does not indicate that it is an abundant species, but that during the winter it feeds on common land, short pasture used for grazing.