hello - i like the idea of using half height walls. Maybe you should show the doors though, so we can see where they open. Also, you show the windows in one place on the upper floor, but not in the other openings. This make the image seem unfinished. On the ground floor, the corridor seems to lead to a dead end, is that the stairs? If so maybe change the viewpoint to make it more clear.
About the colours, you show realistic colours for some things, like the floors for example, but not for other things like the sheets on the beds and the wardrobes. Hope this helps...