The principles for branding your profile picture (or sometimes called the avatar) are simple. Depending on the type of business you’re in either use a photo of yourself or a company logo. If you decide to add a company logo then ensure that it fits correctly and it is not too busy.
Square logos or head and shoulder photos work much better than rectangular logos.
Profile pictures at the time of writing this tip are 73 x 73 pixels. The maximum file size that you can upload is 500 x 500 pixels. This is what users will see when they actually click on your profile picture. When your profile picture appears in someone’s timeline, it will be resized to 24 x 24 pixels.