There's no direct way to delete your profile picture. You can designate a different profile picture by:
- Click on your profile icon and select Photos
- Upload a new photo or select an existing photo.
- Click the "Set profile Photo" button.
If you really want to delete your profile photo and not replace it, there's an indirect way you can do that.
- Upload a new photo and make it your profile icon as outlined above.
- Click on your profile icon and select Public Profile
- Scroll down to the "Recent Activity" section.
- Click on the X next to your uploaded photo to delete it.
Result: Your profile photo is deleted and you will have the default shadow figure profile image.