Here are my picks for the top 10 Golden Age Book Illustrators:

1. Aubrey Beardsley
2. Arthur Rackham
3. John Tenniel
4. Kay Nielsen
5. William Heath Robinson
6. Jessie M.King
7. Harry Clarke
8. Maxfield Parrish
9. Mabel Lucie Attwell
10. W. W. Denslow

Please fell free to add comments or suggestions to the list.