Hello there, @bloogle_bloog ...
Are you talking about your profile picture within Canvas or within this Canvas Community website? I'm not sure if you're able to recover previous profile pictures (unless you had an image saved on your computer that you could re-upload). Here are some Guides for you:
For your Community profile, if you click on your avatar at the top right corner of the page, and then click on "My Profile", you'll see a large image that you can click on. Thi will take you to a screen where you can upload a new image for your Community avatar on this website.
I hope this will help a bit. Let Community members know if you have any other questions about this...thanks!