My 4x6 problem

I've realized recently that I have a real problem with taking most of my photos vertically (meaning 4x6, meaning it's width is shorter than it's length). I don't know why exactly, but there must be something about how I can arrange my subject in the shot vertically better than horizontally. But no matter the angle, Baby Miley is adorable!

Here's the one shot of the set that isn't vertical. Better enjoy it while it lasts!