set a symbol marker with highchart

highchart has an option which will let me set a marker to certain value.

highchart doc:

...
     data: [7.0, 6.9, 9.5, 14.5, 18.2, 21.5, 25.2, {
        y: 26.5,
        marker: {
           symbol: 'url(/demo/gfx/sun.png)'
        }
     }, 23.3, 18.3, 13.9, 9.6]
...

As you can see, the position 26.5 gains a png image as its marker.

My question is: How can I set it to a certain value from my array?

$.getJSON('ajax/lineChart.ajax.php', function(data) {        
    $.each(data, function(key, value) {
        var series = { 
            data: [ {
                y: 0,
                marker: {
                    symbol: 'url(img/fail.png)'
                }
            }], //data array for new series
            name: key,
            marker: {
                    symbol: 'square'
                }
        }; 
        series.data = value;
        options.series.push(series); // <-------- pushing series object
    });
    var chart = new Highcharts.Chart(options);  
});

i tried this, but nothing appeared. The chart ran without the marker.