The PDR article doesn't mention any link between them, but Clarke's illustrations look very influenced by Aubrey Beardsley to me. I find both interesting as examples of the kind of thing that minimalist/modernist aesthetics both destroyed and grew out of (in the sense that Beardsley and Clarke both display the Victorian horror vacui and love of ornamentation, but also experiment with huge swathes of empty space):

http://www.victorianweb.org/art/illustration/clarke/decadent...