It sounds like you are looking for some setting that converts a plain text web address into a link, which as far as I know, isn't possible.
However, if you know that the results from your database are strictly picture locations, you could do the following to loop through your results and display them:
<?php
$picture = //query for picture
while ($row_picture = mysql_fetch_assoc($picture)) { ?>
<img src="<?php echo $row_picture['picture_link']; ?>">
<?php } ?>
I haven't tested that so I'm not completely sure it works, but it should. You can do something very similar with links if you need to.