Dealing with nondescript paint areas

I  reduced image exposure and contrast to get bare essentials of  whats left in these two examples. Those traces of pattern that show up especially in foreground  is what I feel needs to be absorbed to get the most out conveying the space when areas are hard to define. If bares bones B/W structure is traceable in a painting, your eye or paintbrush should be able to fill in the rest.

 

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