I really like the idea of adding a simple element such as water to a picture of someone because it represents power and looks very clean. The designer even gives you tips on how to do it and I think it's very do-able in photoshop.
We are typically very aware as to which character is to be seen as the hero and which one is the villain. However, sometimes this leads us to look past the mistakes and flaws of the hero. Which creates a bias, thus making the villain look even worse.