The scale in that last shot is wierd, I just can't get my head around it for some reason. The first area looks the most interesting but could have benefitted from some things above the current ceiling line - 3D skyboxes are there to be used for situations like that

The second shot is just too empty, and the same wall going all the way around without any variation looks really dull. Seems to be a decent enough effort though, I just hope you go a little more detailed next time around.