His parents were wealthy, so he did not need to endure periods of artistic struggle. Most of his career was spent in Barcelona, though when a young artist he split his time between Barcelona and Paris. He also spent some time in Madrid where he made portrait drawings.
Those drawings were mostly or entirely of men, and men likely were subjects of much of his commissioned portrait work, though images of these paintings are essentially absent in Internet searches. Besides his portrait drawings, most Web images are of women. Some of these are shown below.
This is perhaps my favorite Casas painting.
His older sister.
His younger sister.
Another well-known painting. Madelaine is smoking a cigar, but that must have been okay in Montmartre in those bohemian days.
Seven years later, this Parisienne is shown in a costume with similar colors to those seen in the preceding image.
Another Paris painting featuring a beautiful young woman.
Something of a sketch, but signed and dated by the artist.
His model, mistress, and eventual wife.
She was the wife of painter Miguel Utrillo, possible father of french painter Maurice Utrillo, son of Suzanne Valadon.