These three portraits appear on the website of the National Portrait Gallery.
The sitters are, respectively,
Sir Robert Walter Carden, 1st Bt by Sir Leslie Ward, watercolour,
published in Vanity Fair 11 December 1880
Sir Robert Walter Carden, 1st Bt by London Stereoscopic & Photographic Company,
woodburytype print on paper mount, 1870s-1880s
Sir Sackville Hamilton Carden by Bassano, vintage print, 1915.
The NPG has 16 Carden portraits but only these three appear on its website.