Try a very thinned glaze of Brown ink and clean water over the whole model....approx 1 part ink to eight parts clean water ..wash the whole model carefully avoiding pooling up of ink.. You will find this will richen the colour up a lot and take away some of the Graininess from drybrushing...There is a good seperation of colours here and a little help with a few techniques could lift your painting a lot..good luck.
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