There are so many better things you could put on your chest! Symmetrical, flattering, awesome things! Why why why why why why would you put a line drawing of a BIKE on your BOOBS? It makes her left boob look 10x bigger and droopier than the right because the left wheel is so much bigger.
At least it's well done. And I hope it's just the first outline and that she went and got it colored in later. And maybe put some stuff behind it to even the whole thing out.
p.s. my friend has a blog about funny emails he gets at work, if you're bored you should check it out.