There are many directions you can go after taking Photo 1. Photo 2 would be the most obvious. Here are some of the diections I have gone. I have also taken 16 photo related college courses and many workshops as part of my retirement interest in the subject.
Black and White Photography, a basic manual, Henry Horenstein, Little Brown
Which you have looked at but not studied
BEYOND BASIC PHOTOGRAPHY- HORENSTEIN, Henry, Little Brown, 1977
Color Photography: A Working Manual, Henry Horenstein
Building a Home Darkroom, Ray Miller, Kodak Workshop Series, 1996 x2
Complete Photography Course, John Hedgecoe, 1979
Creative B&W Photography, Les McLean, David Charles, 2002
Blakemore, John’s Black & White Photography Workshop; D&C; 2005
Photo Imaging, A Complete Guide to Alternative Processes, Enfield, Jill, Amphoto, 1991
Photo Know-How, The Art of Large Format Photography; Koch & Marchesi, Sinar, 1993
Platinum & Palladium Printing; Arentz, Dick; Focal Press, 2000
Printing Special Effects, Julien Busselle, 2000
Processing And Printing, Julien Busselle, 2000
Weston, Edward, The Day Books of, edited by Newhall, Aperture 1981
The Master Photographer’s Lith Printing Course, Tim Rudman, Argentum, 2006
The Photographer’s Toning Book, Tim Rudman, Amphoto, 2003
A World History of Photography; Rosenblum, Naomi; Abbeville Press; 3rd Edition; 1997
The History of Photography, Beaumont Newhall, MOMA, NY 1988
Les McLean and Tim Rudman are members of APUG and give wonderful workshops all over the world.
Direction and depth are really up to you to decide.
John Powers