I didn't vote on this challenge, let's start with that.
I really like this photo, the contradiction of the cold vs the summer clothes, the freshness of the pose/dance, the beautiful background and the balance of the blue and red/orange tints. the composition is quite good.
The reason why it didn't score higher is probably because you, dancing around on that snow, are the main subject here. You draw all the attention. The background, with the reflection, becomes the secondary subject. For this picture this is a great background, but challengewise the background is not the main focal point, not the in your face subject and therefore the whole photo gets rated lower.
Personally, I really don't like the border. The bleu tone of it is so bright that it pulss the eye out of the frame. Use a darker tone of blue or just black or no border at all.
I'd give it a 6 in this challenge, otherwise it would be a 7+