Round 2 of the Celt paint plan test. This test set uses 4 washes:
The GW washes dried matt with even/smooth shading over the whole figure. Black and Mud returned very similar results with the black darker by a hair.
The Wonder Wash washes dried with a high shine. Shading is uneven with puddles at the feet and at the bottom of shields. The Dirty Dark Brown is very red and produces a very unpleasant effect on light under colors.
Conclusion: I will be using two washes on the army models: Devlan Mud on cloth/weapons and Gryphonne Sepia for skin. The skin tone with Devlan Mud is far too dark for fair skinned Celts, but could be perfect for a more Mediterranean look.