I read a report long time ago saying that
1. When browsing web pages, people's attention is most easily drawn to human faces.
2. A beautiful female face looking straight at you is the most eye-catching.
(Sounds like common sense, huh, haha)
In this article "How A Pretty Face Can Push Visitors Away", it uses the advertising example I mentioned before. The idea is: after attracting the audience with a pretty face, you still need to guide them to focus on the content you want to deliver.