Random Image - Display Image Text with Image
Are you referring to this Random Image block?
Will this other one do the trick of showing the image title under the image?
I must also point out that this is a 5.6 site.
$title = $f->getTitle() echo $title;
I'd set up a new block override or theme then add this code above where you want it.
If you want help PM me and i can take a look
Add following code to bottom of the view.php file and edit the image title in the image properties.
<div class="title"><?php echo $img->title;?></div>
Then if needed style it from the view.css file.