The first thing I'm drawn to in this photo is the diagonally symmetric lighting. The strong white in the upper right hand corner that flows in scale down to the darkest part of the image in the bottom left. Psychology would tell us that as a species we find symmetry to be beautiful and this picture makes perfect use of it to enhance its appeal.
The colors in the image are unusually noticeable for a picture that has this kind of focus on sunlight. Rather then be washed out in the white light the little orange leaves quietly yet noticeably pop. The green of the unusually mossy forest floor is nice and distinct.
The scene itself is has a primal quality. Without seeing what is around the immediate image I would imagine this to be a virgin forest, and that quality makes this a photo that really draws you into itself. These are timeless woods and only teasingly hint at the autumnal season.
In all, a high impact image that initially arrests the eye and then draws you out of yourself and into its scene.