The peak of his career seems to have been in the 1920s. He depicted in representational style, though there was some of the simplification fashionable at the time.
Images below are in approximate chronological order.
Painted during the Great War when Belgium was mostly occupied by Germany.
Another wartime painting.
Mannered, the setting harking to early paintings using one-point perspective.
Now we see a whiff of modernist simplification on the woman, but not the others.
Slight simplification here.
The date was what was shown on the druot.com website. Not impossible, but I think it unlikely that an ordinary Belgian could easily travel from German-occupied Belgium to neutral Portugal during World War 2. 1930s seems more reasonable, but admittedly that's only a guess.
No date for this. Perhaps 1930s, maybe post-war.