Thanks for the comments.
I never really manage to master the ink/washes techniques and I use mainly layering and dry brushing...
Uryens: that's sound like a good idea to use a darker brown in the shadowed area, I would give a try and post the results...
For this result I start from a base of 6/8 white skull, 1/8 bestial brown 1/8 bubonic, then layered adding more bestial brown in the shadowed areas and more white skull and the highlight areas. Top link the layers, I dry brush everything with white skull.
Here is some shots of my swordsmen
I always mix an additional colour with the red and blue to differentiate each regiment and to add some diversity to my painting as well