Winter offers a different light schedule versus the more famous "Midnight Sun" of the summer. The ideal (diffused) photographic daylight is limited to before sunrise and after sunset; however, there are potential upsides:
1) The sun never rises very high, so the result can be a warm pinkish light throughout the day
2) Because of the sun's low trajectory, the sunsets and sunrises can be LONGER and REDDER
3) The potential for Aurora Borealis during night photography if conditions are right.
Because the interior of the island is closed during the winter, there will be fewer photographic targets compared to the summer; however, each available target will be unique due to its frozen or semi-frozen nature.