The space given for Profile picture is just 180X180. Use it wisely! Facebook recommends Pages to “use a consistent and branded profile picture that scales well from 180×180 to 32×32 pixels”
If you use a picture that i
s too complicated or too big, it just gets lost on the users. A well made profile picture has simple elements such as a logo, an icon, a small image, one-word text that can catch the attention of the fans in their newsfeeds. Remember, Facebook is a game of eye-catching visuals above anything else. Profile picture is what the fans get to see when they are not on your Page. Everywhere else, such as newsfeeds, comments, Likes section on fan profile etc, it is the profile picture that appears and a bad picture is a lost opportunity.