Trying a literal SPOTlight with flashlight.

This is an experiment. I was trying to get a very literal, very unsoft spotlight on her mouth. This is what I got, anyone know how to do this?

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You need a "Snoot"

The longer it is, the more pronounced and defined will be the circle of light.

Buy some black foam paper (art store like Michaels) and make a lighting modifier to snoot your flash. Foam paper is great for making all kinds of lighting modifiers.

If you want to use a flashlight, flicker/shake the light over the area during a long exposure. It will soften the lighting, control the gradient, and allow you to put light where you want it. On large subjects, try to only go over an area once so if they move it will stay sharp. They need to hold their breath for 20s. About F22 for 20s with your typical flashlight. Have a black backdrop if you don't want it to show.