You can't see it but to the left of janis joplin outiside of the window there is a dove this would be in reference to her song "blowing in the wind"
and lucky's right it is in reference to jimi hendrix's song angel....
now observe where the ground is breaking with all the faces and what not......then google in utero and look at the back of the album.....very simular
also the rose......what song is this from?
or is it from the cover of incesticide by nirvana? check that one out.
lastly for the people that can't see the full photo that's displayed there is a spilt cup of coffee, a strawberry milk shake i'm assuming, and then below the ball and chain there is a butterfly coming out of it's cacoon