Don't worry Aleni personally I don't need to accept your offer my images are signed and keep it where I saw them..There are some pics I did in collaboration with some friends, I used their backgrounds with their permission and they are not signed by both of us or by one of the 2 authors...I would them removed, but too big the site to find them again...anyway it's gone...just be careful in the future...
You know, someone asled me if I had permission to used someone else images as backgrounds for my works, of course I had it and you can see they also commented saying they liked what I did with their works, but it doesn't matter, the important thing was to dimonstrate they gave me permission to used it officially...so it's terribly difficult...

This is what I hate, they ask artists that do regular things and they do nothing to those who are stealing really our images...***

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I believe you and I'm sure not that you know where the original pics are posted you'll be more careful in take the responsability of what you post and how.
I understand if you find some images around the web with no signature or even if with it you cannot be sure if the person asked permission or not, please be carefull if you see that the pic have a signature on and the name of the person who is posting is not the same be careful...probably is not the authour of it...
I found many images me too, I could use as background for my images, but the risk to do something wrong as it happened to you is big, so I prefer not to take them...

As you can see there are many web site with our images stolen, and you can understand why we were so angered with you, even if you didn't know the reality of it.Be careful in the future, it can happens someone will not accept the explaination that: you didn't know....just be careful..take care
Hugs Aralt3