For Japanese, Christmas dinner is usually chicken and cake. Booze is involved as well. And the more discerning individuals, spend their meals with those closest to them. Alone.
These types of photos are very much a Japanese internet meme — people showing their Christmas meal and female characters with whom they are eating. They're more a gag than anything else with each photo trying to outdo the others. Not entirely serious! Though, still, slightly bitter sweet.
One of the pictures might be NSFW. Guess which one.