This proved to be another case of learning how to use the wash. In some cases it did its job extremely well, that is, turning recesses black, but in others it merely tinted them grey.
A complication with this mini is that some of the recesses are very slight and so it takes finesse to get the wash targeted into only that recess. To compensate for this I think I will try putting a bunch of wash on and then painting over whatever gets onto the surrounding areas.
In some places where the wash worked I found the effect undesirable. On the yellow fabric folds in the back for instance, I think a brown wash would have gotten me a better look:
Also in the works today:
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Wile E Painter's Hobby Blog 