Looks pretty sweet to me
I love how the reflections on the outer surface of the observatory betray an uneven surface as the camera moves.
Imo, your surfaces look pretty good in general, but is there any way to finagle more detail onto the scope and mount? They look maybe a little to pristine to my eye.
I don't know what render engine you're using--is there some radiosity going on there? I think I'm seeing some soft shadows around the base of the mount.
As test renders go, it looks pretty fine to me. One thing I remember from the time I spent messing with 3D is that an image--and even moreso, an animation--is never "finished," but rather just eventually gets to a point where it's acceptable.
I look forward to seeing more renders!