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$arID = array();
foreach($arResult["SEARCH"] as $i => $arItem)
{
   if($arItem["MODULE_ID"] == "iblock" && substr($arItem["ITEM_ID"], 0, 1) !== "S")
      $arID[$arItem["ITEM_ID"]] = $i;
}

$grab = CIBlockElement::GetList(array(), array(
               "ID" => array_keys($arID)
            ), false, false, array(
               "ID",
               "IBLOCK_ID",
               "PREVIEW_PICTURE",
               "IBLOCK_SECTION_ID"
            ));
            
while ($ar = $grab->Fetch())
{
   $arResult["SEARCH"][$arID[$ar["ID"]]]["PICTURE"] = CFile::GetFileArray($ar["PREVIEW_PICTURE"]);
   
   # собираем ID-ки секций элементов
   if (intval($ar["IBLOCK_SECTION_ID"]) > 0)
      $arSectionsIDtoIndex[intval($ar["IBLOCK_SECTION_ID"])][] = $arID[$ar["ID"]];
}

# если собрали какие-то секции, то получим их
if (sizeof($arSectionsIDtoIndex) > 0)
{
   $dbSections = CIBlockSection::GetList(array(), array(
                  "ID" => array_keys($arSectionsIDtoIndex)
               ));

      while ($arItem = $dbSections->GetNext()) 
   { 
      # раскидаем секции по массиву результата 
       foreach ($arSectionsIDtoIndex[$arItem["ID"]] as $key => $val) 
      {
            // echo $pr_val." ".$arResult["SEARCH"][$pr_val]["NAME"]."<br>";
            if (isset($arResult["SEARCH"][$val]) ) 
            { 
               $arResult["SEARCH"][$val]["SECTION_PICTURE"] = CFile::GetFileArray($arItem["PICTURE"]); 
               $arResult["SEARCH"][$val]["SECTION_DESCRIPTION"] = $arItem["DESCRIPTION"]; 
            }
          
      } 

   } 
}