$collection = $this->_addProductAttributesAndPrices($collection)
        ->addStoreFilter()
        ->addAttributeToFilter('is_discontinued', array('neq' => 1) )
        ->addAttributeToFilter('collection_id', array('neq' => 'LKG') )
        ->addAttributeToFilter('media_gallery_label', array('eq' => 'Home Page Image') )
        //->addAttributeToSort('entity_id', 'desc')
         ->addAttributeToSort('news_from_date', 'desc')

For the media_gallery_label field, I need to be able to filter by any gallery images, and if the label of any of the images is "Home Page Image", it needs to display instead of the default "small" image. I need this to work only in new.phtml file, and not in the list.phtml.