Photos of the Keith station are quite hard to find. I couldn't see any on Flickr although there are photos of the goods shed.
If anyone has access to the book Line Clear
by Reece Jennings, this has several photos of the stations at Keith, Coombe and Tintinara in the 1970s and 80s. Plus interesting pictures of busy scenes with very varied rail traffic at Bordertown & Serviceton in the 1980s.
Obviously I can't post scans of these for copyright reasons.
commented, the stations look to have been built by the same architects and builders as those roadside toilet blocks you come across in the little towns along the Dukes Highway.