I took a look at your photo on Flickr. Your photo is under "All rights reserved" which is set at default when uploading pictures to Flickr.
"You, the copyright holder, reserve all rights provided by copyright law, such as the right to make copies, distribute your work, perform your work, license, or otherwise exploit your work; no rights are waived under this license."
Taken from Yahoo(Flickr) here.
Reading Yahoo´s terms of service you retain all copyrights to the pictures you upload to Yahoo´s services such as Flickr, but you give Yahoo the worldwide, royalty-free and non-exclusive licence to use, distribute, reproduce, adapt, publish, translate, create derivative works from, publicly perform and publicly display your pictures.
Taken from Yahoo terms of service under "License from you to Yahoo"
So Yahoo does not own your pictures but they can use them however they wish. This license will end as soon you or Yahoo removes the picture from their services.
This does not mean anyone else can use your photo.
If your picture has always been under "All rights reserved" they have no rights to use your picture and are not backed up by Flickers creative commons license.
I'm no lawyer or anything close to one so it is possible I might have misunderstood something.
I hope everything works out for you