For bringing out textures or/and brush strokes, I often use an edge detection filter layer set to overlay. Use one of the top/bottom/left/right options, control strength with the radius setting and add a HSV filter mask for some fine control.
The more contrast there is in the structures, the more pronounced the effect will be. Strongly textured brushes work well for this. like in this one:
Sometimes I will duplicate (parts of) the image and apply an oil-paint filter to the overlay before edge detection, in order to break up the edges a bit. Lots of possibilities…