All appear to be mid 20th century and by the Lewis Smith Company, each pencil and watercolor on paper. Several stamped for the company. From a New York Times 1996 obituary: 

Mr. Smith, in his 50-year career, designed lighting for the Cathedral of St. John the Divine and the National Episcopal Cathedral in Washington, as well as other churches and public and commercial buildings.

In 1939, he designed the lighting for Peacock Alley in the Waldorf-Astoria.

Mr. Smith was born in Brooklyn. He graduated from St. Lawrence University in 1927. Mr. Smith eventually opened his own business, the Lewis Smith Lighting Company, with offices in the old Architects Building on Park Avenue.

He was a charter member of the International Association of Lighting Designers. In 1983, Mr. Smith received the Designer Lighting Forum Honor Award.

Dimensions: from 14" x 21 1/2" to 30" x 15". 

All in overall good condition, some discoloration and light stains.