It almost seems tilted back (the wall/door/arch) rather than perpendicular to the ground plane - which is probably an optical illusion, but it is slightly disconcerting.
I agree that some more 'drama' would help it look a little less flat - just angling the picture to look a little more across the stairs and arches, perhaps, and tweaking the lighting to add some visual interest. The model itself is nice, some pretty solid architecture

I like the stone railing (well, really, the stonework all over the piece, I love old buildings).