We utilize Gravatar's service to manage the profile photo that would be tied to the email on your account. You're able to link your Linux Academy account to Gravatar by signing up for an account with Gravatar with the email address from your Linux Academy account, here: https://gravatar.com.
From there, upload an image to your Gravatar profile and set the image rating to "G". This will allow your Linux Academy profile image to pull from Gravatar and within a few moments it will display!
If you're running into an issue where you have a Gravatar account with an image uploaded, but it will not display, you can check the email address your Gravatar account is using, here: https://en.gravatar.com/site/check/.