Answer:
Leading lines are lines that appear in a photograph that have been framed and positioned by the photographer to draw the viewer's eye towards a specific point of interest. These lines often draw the viewer's eye in a specific direction or towards a frames collectively frame place (a picture or photograph) in a frame
In photography terms, the frame refers to the edges of the photograph or your cameras viewfinder, so filling the frame means to make the subject(s) a significant part of your final photograph.
simple backgrounds are for simple people
You forgot the rest of the question...
The Parting of Lot and Abraham is about their literal parting - Abraham took his family to Canaan, as God wanted him to, whereas Lot went to Sodom, and defied God's wishes. Now, having this in mind, maybe this mosaic does symbolize B. heaven, as Abraham and his family would go to heaven eventually, because they obeyed God's orders and wishes.
