@elevown That's from Marisa's art in the new game, Hidden Star in Four Seasons. As you can probably tell from the title, it has to do with the seasons - basically the seasons are messed up and Marisa's house ended up covered in snow during the middle of summer. The same goes for the other playable characters, with Reimu being spring, Aya being fall, and Cirno being summer.
As for the characters, it's a bit early to tell. However, people seem to like Narumi (her official art is quite cute, especially for Zun) and the third stage boss, Komano Aun, for being so damn nice. Also the final boss, Matara Okina, for her involvement with the creation of Gensokyo.