modern art after WWI

modern art after WWI talk about modern art after WWI how it happened ? why ? what are the techniques , brushworks ,colors used biiiiiig part : take 1 or 2 most famous paintings and analyse them : where have they been painted , when , who is the painter (a little background about the painter) where is the painting hanging analyse how it is being hanged .. analyse the color... (primary ... ) , the texture, the material used , the brushwork (heavy ,light ...)  the shadows the lighting