For me, you've missed both aspects of the challenge theme here. You've frozen the motion, and you haven't really presented any real aspect of Abstract.
Very nice! Im impressed with how clear the picture came out even though its obvious that it is a motion photograph because, of the snow behind the snow boarder. Nice.
I love how everything is motionless except for the wake in the snow. The juxtaposition of the detail of the background trees with the smooth foreground is also really nice. 8
I've been using the definition: "Of, relating to, or being a style of art in which natural objects are not represented realistically." It is a very nice shot, but other than the colors being different, it doesn't seem very abstract to me.