A brief biography is here. Even though Russell is not well known these days, he was noteworthy enough in his time to be knighted.
Like many English contemporaries, his style changed little over his career. Based on images found on the Internet, he tended to make paintings with a warm (in the color sense) feeling, though there are some that differ. It seems he liked to portray women. A quirk in many of those portraits was his use of backgrounds with green-blue wallpaper containing many small elements in other colors. Besides similar or identical background wallpaper, Russell usually included framed pictures hanging on those walls. Doubtless these details were from his house or studio.
Russell did some landscape painting.
Crawhall was one of the Scottish "Glasgow Boys" group of painters.
"Stuffy" Dowding was in charge of aerial defenses during the Battle of Britain.
A carefully done background, but no wallpaper in this comparatively early work.
Still no wallpaper, but there are pictures on the background wall, so we're getting closer.
A late portrait with wallpaper and pictures.
I don't have a date for this, but the background is archetypical Russell.
Here Russell adds a mirror, but the standard background remains.