Another horse head!
The only breed I think about when looking at Black Tobianos is the Paint Horse.
Also I kinda accidentally made this one look like a Throroughbred, or that could be me.
Like with the blue roan it was a bit hard to work with the darker colors.
For this one the main base colors were a dark desaturated violet/purple, lighter whiteish violet, a dark purple, and another dark desaturated violet but it was closer to a blue. Then for the shading I used two dark desaturated greys but with a hint of blue. Finally for the lighting I used a very saturated light blue and another light blue however less saturated.