These may be fan art, since the quality of the pictures is not what someone would expect from Lucasfilm and since the source of these images is not Disney, Bad Robot or someone else involved with the movie. That being said, I believe this are real, because there’s too many detail in these pictures. These can be promo posters that will be given to the fans at the Star Wars Celebration just like Marvel did when they gave away the poster with Black Panther in full costume when they had their own Marvel Event. Let’s just wait and see. It’s good to have a closer look at Kylo Ren. I like what I see.
I think these are real, what is happening behind the characters match with scenes I’ve heard about the movie.
Source: Making Star Wars