Arthur Rackham (First published 1906, UK) Gothic style, rather dark. Also illustrated Wind in the Willows, Alice in Wonderland, Fairy Tales, etc.
F D Bedford (First published 1911, US) Black and white full colour intricate woodcuts. Also illustrated The Magic Fishbone by Charles Dickens, Forgotten Tales of Long Ago etc.
Mabel Lucie Attwell (First published 1925, UK) Light watercolours, pastel shades. Also illustrated Alice in Wonderland etc.
Gwynedd (M) Hudson (First published c. 1935, UK) 3D pictures, like old fashioned Christmas cards. Picture on the headline (i.e. top of the page). Also illustrated Alice in Wonderland.
Scott Gustafson (First published 1991) Detailed oil painting, slightly Victorian looking (like a chocolate box). Also illustrated Alice in Wonderland, Wizard of Oz, etc.
Michael Hague (First published 2003, US) Shows detailed textures, colouring slightly similar to pencil drawings. Also illustrated Wind in the Willows. Hans Christian Andersen, etc.