Right now I think your picture is just kind of too white and cramped. Itís hard to tell the midground from the foreground.I can barely see the balloon in the distance, and the mountains in the background are all but invisible. Iíve done a bit of a paintover during lunch today. Hopefully it may give you some ideas for some more interesting things to do.
Seconding Mano, and I think it can be pinned on the house itself. It's probably just be a result of this still being a work in progress, but the house doesn't feel like it's settled on the ground. Rather the back feels like it's floating due to how differently it's angled compared to the cliffs and everything else immediately around it. It also doesn't make much sense for the house to be angled as it is, with how close the driveway would have to be to the edge of the cliff to enter the garage.
Modifying the cliff edge so that there's more space in front of the garage for a vehicle to turn would probably fix this.