An illustration is like a fingerprint and is possible to recognise the illustrator from an illustration. Here is some examples. Mabel Lucie Attwell-tiny children, pixies (signed). Arthur Rackham: Dark...
As well as buying books for entertainment, or to sell on, another thing is to use the information they possess. Indeed in this cash hungry times, it may be a way to make money. For most books, it doesn't...