Your profile photo would be the one associated with your Facebook profile. I've disconnected your account from Facebook so you can reconnect it. This should help with your profile photo reappearing.
To connect your Pandora account to Facebook from a computer:
Sign in to Pandora's website and click the icon (initial or picture) in the top right corner of the page.
Select Account in the left hand menu.
Scroll down to Social.
Select Connect to the right of the Facebook option. A screen will pop up prompting you to sign into Facebook. Make sure to sign in with your Facebook account information (email address and Password), which may be different from your Pandora account.
If you'd like to edit these settings in the future, you can go directly here.