If you compare Picasso’s earliest self-portrait and the last one, they’ll be extremely different. An evolution or style, or an artist adapting to the situation? You decide!
But if you then compare Picasso’s work from the time he was a young man until the time of his death, some common thread emerges: you can tell the paintings were done by the same man.
“The different styles I have been using in my art must not be seen as an evolution, or as steps towards an unknown ideal of painting…” Picasso commented on the phenomenon. “Different themes inevitably require different methods of expression. This does not imply either evolution or progress; it is a matter of following the idea one wants to express and the way in which one wants to express it.”