Olga, Helen, Yuri and Sergey Mataev
Olga's Gallery: Thomas Gainsborough
Olga gives you many Gainsborough works, including "Mrs. Siddons". You can also link to a bio page on the site.
Wikimedia
Wikipedia: Thomas Gainsborough
This site provides an excellent depiction of the artist's life. Includes his influences and a photo of one of his greatest paintings, "The Blue Boy."
J. Paul Getty Trust
J. Paul Getty Museum: Explore Art: Thomas Gainsborough
Information about the artist and about four portraits by Gainsborough on display at the Getty.
Museum Network (UK)
Museum Network: Talking Objects: Gainsborough: Dr. Rice Charleton (1710 1789)
An examination of a portrait by Gainsborough demonstrates how the painting's details reveal information about the subject.
Curated OER
Educational Technology Clearinghouse: Clip Art Etc: Gainsborough
(1727-1788) Landscape and portrait artist who did such works as The Blue Boy and The Harvest Wagon.