You kept the muted colors of the concept art, but brought in much more saturated foliage so the house seems extra dull/grey in comparison. I'd try making the house a bit more saturated or dulling the foliage to match the concept. The house could also use a bit more of the gardening and plants of the concept, feels less inviting because of it. I don't think the background hills/mountains are doing anything to help the look and feel of the scene. The house if anything is looking smaller and gets lost in the grayness of the distance fog.