You’ll want to pick a profile picture that will be easy for your potential 
fans to recognize. This could be anything from a company logo for a big brand to a headshot of yourself if you’re a solopreneur or consultant. Being recognizable is important to getting found and Liked — especially in Facebook Search. Your profile image is pictured at the top of your Facebook Page and is also the thumbnail image that gets displayed next to all your Facebook Page updates, so choose wisely.
When choosing a photo, keep in mind that Facebook requires your profile picture dimensions to be 180 pixels by 180 pixels — even though the image will display as 160 pixels by 160 pixels on desktop computers.