Find Products with No Images

You can find the collection for below code.

$_products = Mage::getModel('catalog/product')
->getCollection()
->addAttributeToSelect('*')
->addAttributeToFilter(array(
array (
'attribute' => 'image',
'like' => 'no_selection'
),
array (
'attribute' => 'image', // null fields
'null' => true
),
array (
'attribute' => 'image', // empty, but not null
'eq' => ''
),
array (
'attribute' => 'image', // check for information that doesn't conform to Magento's formatting
'nlike' => '%/%/%'
),
));

you can got all product list which has no Images assign.