This is an illustration for East of the Sun and West of the Moon by Rosie Lauren Smith. The Arthur Rackham and Tasha Tudor influences are perhaps the most apparent. It also reminds me a little of Trina Schart Hyman. What I love the most about it is the autumn setting which appears to be the artist's favorite season. So many of the illustrations of the heroine riding the polar bear offer a winter setting. You can see more of Smith's art on DeviantArt (there's a lot of faeries and such) and she also has a blog.