No one really knows because he wasn't part of any art movement at the time. Although most people say it was Cubism.
Addition:
... which it really is not.
Most Picasso paintings after 1920 are in styles peculiar to Picasso and with no names.
No but i am not sure what kind of painting it is
oil on canvas
In a private collection - do not know where.
Because he did not paint in the style of the 19th century.
Cubist
Picasso did not have a specific style, he just painted his own style, based on the period he was in, such as the blue period, where everything was very dull and miserable because nobody thought he could paint, or the rose period
he painted in the style of cubism but also done some sculpters
I think you know he changed styles all through his life.
It is an oil painting, expressing Picasso's anger at the bombing of the town of Guernica.
Picasso usually used paint for his pictures
Picasso uses cubism.