Вывод изображения связанного элемента в детальном описании

 // result_modifier.php
$res = CIBlockElement::GetList(
    array(
        'DATE_CREATE' => 'ASC'
    ),
    array(
        'ID' => $arResult['PROPERTIES']['ATT_LINKED']['VALUE']
    ),
     false,
     false,
     array(
         'NAME','PREVIEW_PICTURE','DETAIL_PAGE_URL','PREVIEW_TEXT'
     )
);
while($ob = $res->GetNext()){
    $ob['PREVIEW_PICTURE_SRC'] = CFile::GetPath($ob['PREVIEW_PICTURE']);
    $arResult['LINKED_NEWS'][] = $ob;
}

// template.php
 <?foreach ($arResult['LINKED_NEWS'] as $NEWS) {?>
        <div class="col-lg-3">
            <a href="<?=$NEWS['DETAIL_PAGE_URL'];?>">
                <img src="<?=$NEWS['PREVIEW_PICTURE_SRC']?>" alt="<?=$NEWS['NAME']?>">
                <h4>
                    <?=$NEWS['NAME']?>
                </h4>
                <p>
                    <?=$NEWS['PREVIEW_TEXT']?>
                </p>
            </a>
        </div>
        <?}?>