REMOVE

1. eyeglasses
2. sitting
3. trees
4. rugs (textiles)
5. exterior views
6. backdrops

WHAT

1. forests (plant communitie … (1)
2. landscapes (representatio … (1)
3. mountains (1)
4. railroad stations (1)

More 

WHERE

1. Lake Louise, Alberta, Can … (1)

WHO

1. Clyfford Still; Still, Cl … (1)
2. Still, Clyfford (1)

WHEN

1. 1920 (1)
2. 1945 (1)
3. between circa 1929 and ci … (1)