Achieving realistic dark skin tones in acrylic portrait painting requires careful layering and color mixing. Start with a light base coat with Burnt Sienna. Start adding middle tone with Burnt Sienna and Yellow Ochre and White. Ultramarine blue, crimson, white and umber for the highlights. Then gradually build up additional highlights using white and highlight tones with a round brush. The key is blending smoothly and adding subtle glazes to capture depth, richness, and natural warmth of the ski