The three pictures were taken by DSCOVR spacecraft on the day of December 21st, 2017 at 15:10 UTC which was around the December Solstice, and September 23rd, 2018 at 02:24 which was around the September Equinox, and June 21st, 2018 06:13 UTC which was around June Solstice. The September Equinox was at 01:54 on September 23rd UTC this year. Distance from Earth to the spacecraft was 1,446,400 kilometres (898,648 miles), and SEV (Sun-Earth-vehicle) angle was 8.07 degrees which mean the spacecraft was about 205,081 kilometres (127,417 miles) away from the straight line from Earth to Sun, so the left edge of the Earth is slightly blurry. Since it was pretty close to the September Equinox, both north and south poles can be seen just about the same amount.
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Image courtesy of the NASA DSCOVR EPIC team.