This look is mostly direct on-camera flash, close camera-to-subject distance, and contrasty processing.

To shoot it:

• Put the camera on a tripod or solid support.
• Turn the room lights on first, autofocus on the subject, then switch to manual focus so it stays locked when the lights go out.
• Use a smaller aperture (higher f-number) for more depth of field and sharpness.
• Use a higher ISO if you want visible grain/noise.
• Slight underexposure can help keep the background dark.
• Stay fairly close and use a short focal length; that can exaggerate the pop-up flash falloff/vignetting.

Why it looks this way:

• The hard shadows suggest the built-in flash was used directly.
• The dark area at the bottom may simply be a shadow from the camera support or lens/flash geometry.
• Strong contrast and possibly a vivid picture style were likely used.
• The warm/orange color can come from white balance changes or cross-processed-style color grading.

If your flash doesn’t create enough circular falloff, try narrowing it with a simple homemade snoot (rolled paper/tube) and then add contrast, warmth, and optional extra grain in post.