it is possible to build an structure like this, the wall above the cutout has enough construction height to support it even considering earthquakes etc. (it would be a bit costly however)
the open skylight above the door also is possible, another option to work the would be to cover it with glass, which would affect the look of the image, perhaps make more realistic as concession to climate.
I think the camera could be placed a bit higher, but on the other hand this kind of luxury house sometimes have more dramatic angles like this. considering the amount of light available and the wide angle I would skip all depth of field effects. the grass patch should align with the plate pattern.
a bit more vegetation or something between the building and the background image would probably also help giving the image a bit more depth.
I think the concrete texture could do with a bit work, especially the wall ends look a bit strange. in the cutouts the texture looks compressed.
the wooden formwork imprint in the concrete on the second story is smaller than the main structure, is is an effect I would skip considering that you already use more materials than only concrete. for this style of architecture keep the variation of the material minimal.
also a light inside the building would be nice. and bit more detail at the entrance.
sorry for a slightly rambling post.
good effort! you are well on your way!