I really dont have a favorite period. I have many artists whose work I amire and, as a working airbrusher, envy..
My artists are Caravaggio,Baziotes, Frank Frazetta, Rockwell Kent, Jmie Wyeth, Dame Laura Knight,Lissitsky (A relative on my Dad's side) Hieronymous Bosch,Franz Kline, Homer, Kathe Kollwitz, . Hell, I could keep reciting names all afternoon. Piccabia, Picasso, Klimt,Rauschenberg, Okeefe.
Theres only good art and bad art. Try to avoid the latter.
Thats all I got to say about that. Im gonna go sit upon my But--tocks