This looks not bad at all, especially day shots. Things you may want to improve: add few more different grass models to bring some variety to lawn, scatter some pebbles, small rocks, debris on gravel surface, accurately paint wetness map, model terrace planks with geometry, add some obstacles to block horizon view, straighten verticals in night33 camera shot.
Be aware though, if you'll decide to do this changes, i'll move your topic to WIP board ;]
