He was capable of making fine society portraits in the vein of John Singer Sargent (who was his friend), while also earlier in his career creating boldly painted images where strong brushwork dominated -- perhaps influenced by the Glasgow Boys.
I was unaware of him until I recently encountered two of his works in Venice's Ca' Pesaro museum.
Now for some images of Robert Brough paintings found on the Internet.
He made a number of sketches such as this during his time studying in France. Doubtless the basis for the paintings featured above.
A combination of solid and wispy. Similar in spirit to Giovanni Boldini.
Society portrait of a man.
Society portrait of a woman with a John Singer Sargent touch.
Society portrait featuring strong brushwork aside from key features.