(A) Keep your profile picture consistent
(B) Change it every day to keep your followers interested
(C) Change once a week and use random images to create visual interest
(D) Change it strategically to match your current campaigns
You could get a better result with a PNG file for profile pictures and cover images with your logo or text. Keep in mind that when people visit your Page, your profile picture will be cropped to a circular shape in advertisements and tweets, but will remain square when they visit your Page. To see how your Page’s profile picture would look after it has been cropped.