This picture shows that you do not need a studio with much equipment, necessarily.
I used a Canon 1D Mark IV camera with a 580 EX II speedlite.
And that’s it. Really.
I had the camera on 400 ISO, manual, 1/60th second, f/4. TTL did the rest with the flash.
The flash which was of course pointed behind me, giving “light from 45 degrees above”. Leading to pictures like the one above, and this:
Which when you zoom in enough shows you The Man In The Pupil:
..which of course is me.
Can you see how my flash aimed backward makes a pattern on the ceiling that looks like an umbrella? That’s the entire point!
Sometimes very simple equipment is al you need for professional work.