I don't see that it matters whether its 1 or 50 highlights/layers, its surely what it looks like thats important? And I would say this looks great. The black looks 3D without being grey and the limited pallette gives a great effect, making for a very striking mini.
Alfonso i think with the standard you paint to you should be able to see that there's more than one highlight on the black, inspite of the fact the photo dosen't pick up the black well, the colours and highlights are so crisp it just dosent show to the true standard, very nice colour choices i have to say and overall top notch mini.