No, you can't control the styling of anything loaded within an iframe from outside of it. You might want to rethink how you're loading the images within the iframe.
A little php would make this fairly easy. If all that you're doing within the iframe is loading an image, you might try something like this:
PHP Code:
<?php
$img = $_GET['img']
?>
<img src="path/<?php echo $img; ?>" alt="image">
Then, you could just add CSS styling to that one page. You would call different images as such: image.php?img=filename.jpg
This is fairly basic. You might want to make a little more robust for real application. But, nonetheless, it does what you need without having to create 100 different pages.
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