the tall format is interesting, but i personally would prefer it slightly squatter. the composition is good, drawing your eye to the bridge and mist behind, but i don't like the green hue, espesially round the trees. The foreground river is a good leading line, but could be cropped a little higher
Nice idea. For me the main feature does not stand out as reflection. Reflections might be in here, but I wouldhave expected them to be a more prominent feature.