Put a spotlight inline with the flashlight prop. Narrow the intensity, like 10 degrees or so. Then turn on atmosphere from the material room, but make it really low. Around 0.002 or so to start out with. Back in the pose room, Select your spotlight, and in the properties panel, make 'Atmosphere Strength' 1.0. Make sure you have a prop behind the figure, such as a wall or Cyclorama or something. Then render. From there, you can tweak the position of your spotlight to make it come out of the flashlight. Good luck!