Picasso's Blue Period define on his works between 1901 and 1904 which essentially monochromatic paintings in shades of blue and blue-green, only occasionally warmed by other colors. This is due to the suicide of his friend Carlos Casagemas.
Works in Blue Period keep focus on the moving feelings of the lives of poor. This is the first time Picasso owns his own painting style. Casagemas, completed early in the year following his friend's suicide, was done in hot, bright hues. The painting considered the first of his Blue Period.
Solitary figures dominate his Blue Period works. Themes of loneliness, poverty and despair pervade the works as well. Possibly his most well known work from this period is The Old Guitarist. Other major works include Portrait of Soler (1903) and Las dos hermanas (1904).
Picasso's Blue Period was followed by his Rose Period.