@Coley Maybe play with the positioning of the snowflakes a little to help reinforce movement in the piece, like they're being blown around in the wind rather than simply falling down? More deliberate placing of them will also aid in reducing the "too much" feeling.
Another thing to consider, to pull focus more on the Marriage Mobile, would be to have areas further away from it go a little darker, so the lights on the cart look brighter. Maybe deepening the shadows on the characters too, pulling more contrast to their faces? You don't have to push it too hard, if you're keeping a kind of soft feel to the piece, but just a little more push of the darks will make those lights stand out better.