Adding the lightbox functionality to an image is pretty easy! You can create an image link pointing to your big image and add the attribute data-toggle="lightbox-image"
to it:
<a href="img/placeholders/image_720x450_dark.png" data-toggle="lightbox-image">
<img src="img/placeholders/image_160x120_dark.png" alt="image">
</a>
You can easily add extra options such as hover controls (you can use anything you like - labels, buttons etc) or image information to an image like shown below:
<div class="gallery-image">
<img src="img/placeholders/image_160x120_dark.png" alt="image">
<div class="gallery-image-options">
<a href="img/placeholders/image_720x450_dark.png" data-toggle="lightbox-image" title="This is some info text about the image" class="gallery-link label label-info">View</a>
<a href="javascript:void(0)" class="label label-success"><i class="fa fa-pencil"></i></a>
<a href="javascript:void(0)" class="label label-danger"><i class="fa fa-times"></i></a>
</div>
</div>