show shared image as thumbnail in facebook sharing in Laravel

I am trying to add share button to albums in website created in Laravel. I have used the code for share button that generated using facebook/developer. The albums are not fixed. It is displaying by fetching from database. So I changed code little to change the link of each album automatically as given below.

<div class="fb-share-button" data-href="http://mysite/albumphotos/{{$album->name}}"  data-layout="button">
</div>

But if I try to share into my facebook account, it is showing some other images in my website. How can I show images in my particular album as thumbnail while sharing??

Can anyone help?