That's actually the right height. Her shoulders are cocked up, and your probably used to disproportionate images. Sure, there not the perkiest of breast, but there firm and right where they should be. Breasts shouldn't start 3 inches below the clavicle.
That's not what "low hanging fruit" means. "Low hanging fruit" as used above is an English expression meaning "something that can be accomplished/obtained easily or with little effort." In this case, referring to how easy the image made it for me to make the pun where a very attractive woman (who in mid 20th century American slang could be referred to as a "bombshell") was here depicted astride an actual bomb. Her breasts and the position thereof were never referenced.