The girl looks like she was crying after an event took place where she was required to wear makeup. (ie wedding, dance, a date, ect). The emphasis is on the eye and the make up running with her tears. This gives the work unity and symbolism.
Relationship between life and death. inside, outside: No information about this but it is two different photographs put together to create a half skull, half face image. That heavily relates to the theme of inside, outside and in between.