Hi, guys, thank you for your kind comments.
Pictures of the back are really not good...sorry.
I use vallejo acrylics for my base colour and highlights, then I come back with Winsor and Newton oils.
For red leather I use mahogany brown as a base coat, add brown sand for the first highlights and buff for the second highlights. Then I use oil paint for the midtones and shadows. usually burnt umber, van dyke brown and ivory black.
Tan leather and skin tones I tend to paint almost the same way. What differs is the base color. For tan leather I use sand or buff as a base color. Then highlight adding pale sand and white. The oil paints are burnt umber and van dyke brown. I don't usually use black on this step.
For the skin color I usually have different mixes for each figure/bust. Usually variations of burnt siena, raw siena, brown sand, white, prussian blue and red all mixed together to give me the base color I want. Then, I get back with burnt umber and van dyke brown, both with some alizarin crimson added to heat the color up. Then I go back and forth adding more van dyke brown to the shadows and white to the highlights until I'm satisfied.
I can't paint NMM so, I like to use model masters metalizers. I usually apply a few oil washes with black and prussian blue and after some transparent red oxide.
When painting gold color I prefer the vallejo gold tones and washes with Van dyke brown.
I don't think I can teach anything to those on this forum, but I'm glad for the curiosity!
Thank you Nap!