Great video:) The only thing I would add is that for the heavy contrast red, I think you made a very common mistake of confusing saturation and value. The effect doesn't sell as high contrast (i.e. reflective) as the midtone and highlights are roughly the same value - take a screenshot of your palette/mini and convert it to greyscale, and you'll see what I mean. The highlights need white added to increase the value contrast, to get a pallete with values closer to the high contrast black (which is why that effect sells really well).
This turned out great! I really like how you lay out each step in these videos. It’s also interesting to see you use medium (matte I assume) on the palette as you go. I’ve been incorporating mediums a lot more since I found your channel and I’ve been really happy with the results I’ve been having.
I think to read as metal you should add some white or near white specular highlights. Stopping at the pure red gives it more of a hard leather look to me. But it's a very interesting exercise, getting different material effects with the same colors. I dig it.
Really good video, Paintman! Having those high detail miniatures is what nightmares are made off and you just showed us a really nice way to overcome it!