I can’t remember who originally shared the tip, but if you struggle (like me) to get your non-metallics to actually look ‘shiny’, you can take a photo of your initial light placement on the mini and just boost the contrast to max and brightness to min. Try to match what you see with paint.
A crop of the little man’s funky ‘metal’ t-shirt with the sliders adjusted per the toot. The artificial increase in contrast shifts the effect closer to what an actual reflective surface might look like.