How to photograph the details of a dark horse in low light

There was an old man who lived in her apartment building who she would see wearing the uniform and badge of a private security service. One morning he surprises her in the basement room where the trash bins are kept. He is standing out of the light staring at a pornographic magazine. He doesn’t look up as she empties her waste basket. A couple days later he is in her dreams, wearing a big costume horse head along with the security guard uniform. He takes off the head and stares into her eyes. ‘I love you’ he says and moves closer, slowly, as if beginning a complicated dance step.