Quite a while back I discovered this wonderful treasure trove of children's art books. At that time one was able to click various links on the images and see them in all their fullness on a digital site. Sadly, the site is no longer functioning -- but at least there are these lovely works of art, most of them rare classics of the 19th century. The image above and below is from the work of Walter Crane.
And have a look (below) at the beautiful Kate Greenaway version of The Pied Piper with its delicate drawings and soft colors. Lovely.
Or this Celtic Tales, with illustrations by Katherine Cameron.