Well, from what I've seen it's the best way to do smooth blends and gradients over larger areas and it's quick too. I don't think it would work for the lower legs or head of the horse, but the flanks and withers would come up very nicely I recon as there are a number of areas with shallow depressions which are time consuming to brush nicely. I'll give it a try over the weekend.
I'm tryinhg to alternate between MoR and RoR, saving the heroes for the end when my skills are back up where they were or better. The variety keeps me interested
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Will.