Definitely Triptych, May-June 1973 by Francis Bacon. At first the painting looks pretty weird and distorted, even scary to an extent, but the meaning behind it is filled with sadness, made me tear up when I read the meaning behind it.
Geez, everybody is so cultured here. I know nothing about artists or paintings in general. But I do have a favourite photograph. It’s a colour photograph from 1920, called ‘Bibi in Eden roc cafe’