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Your code looks great. Have you debugged it line by line?
You can debug your code like so:
<?php echo '<pre>'; print_r( $rand_row ); echo '</pre>'; die; ?>
Do this for each line of code, and obviously change the $variable as you go through each line. This way you can see what data is in your variables.
You may find that there is a field name spelling mistake, or perhaps the return value of the image is an object, not an ID?
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