Photo 1: Scottish highland cow with horns - the narrow DOF emphasises the shape of the horns.
95mm, f/6.7, 1/500s, ISO 200
Photo 2: Strong forelighting and use of a polarizer to deepen the blue sky to black emphasises the strong shape of Kings College, Cambridge.
32mm, f/2.8, 1/2000s, ISO 200, Polarizer
Photo 3: Not as strong a photo (a bit soft due to no tripod and shallow DOF), but the transluscent seed pods lit from behind show shape well here.
70mm, f/4, 1/350s, ISO 400