Hi Elizabeth, nice to meet you :)
On the page for the picture you can scroll down and look on the left-hand side for where it shows your profile (and any others) as being connected to the picture. You can select to remove your profile from the image, then click to save changes. The image can still be found from your watchlist page for a while but will be removed eventually if it is not connected to any profiles.
I hope this helps, have a great day!