Retrieve multiple thumbnail images

webapi.safeAjax({
    type: "GET",
    url: "/_api/msevtmgt_events?$select=px3_heroimage&$filter=px3_heroimage_url ne null&$orderby=px3_heroimage_timestamp desc",
    contentType:"application/json",
    success: function(res) {
        $( res.value ).each(function( index ) {
            $('#main').append('<img class="img-responsive" src="data:image/png;base64,' + res.value[index].px3_heroimage + '">');
        });
    },
    error: function(xhr, status, error){
        $('body').append('<img class="img-responsive" src="/artwork-not-found.svg">');
        var errorMessage = xhr.status + ': ' + xhr.statusText;
        console.log(errorMessage);
    }
});