Your profile picture should be of you, rather than your logo. Why? People like to connect with real people, not with logos or brands. It makes your account more personal.
Ensure that your profile picture is the same as your other social media channels so that there is no confusion as to who you are and what you do. Your photo should be a close-up, friendly pic of your face.
Keep in mind that you only have a small space to place your profile picture. So, ensure that it is cropped well and is clear.
Go to Settings > Profile > Picture > Change Picture
Remember to Save Settings