You can choose a profile picture from the available options in Austin's Odyssey, or use your Facebook profile picture if the game is connected to your account.
To change your profile picture:
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Press on your avatar in the upper left corner of the Home screen to open your Profile.
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In the Profile window, press on your avatar to open the Edit Profile window.
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Select a new avatar, or your Facebook profile picture, if yuor game is connected to Facebook
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Press Save to apply the changes to your profile.
You can also access the profile editing window from the Settings window.