[tsigel]

var imagesHTML = {
        a: "<img src='img/1.png' alt='a'>",
        b: "<img src='img/2.png' alt='b'>",
        c: "<img src='img/3.png' alt='c'>"
    };

    var forDraw = ['a', 'a', 'a', 'b', 'b', 'c'];
    var data = forDraw.reduce(function (result, imageKey) {
        if (!result[imageKey]) {
            result[imageKey] = {html: imagesHTML[imageKey], count: 1};
        } else {
            result[imageKey].count++;
        }
        return result;
    }, {});

    var html = '';

    Object.keys(data).forEach(function (key) {
        html += data[key].html;
        if (data[key].count > 1) {
            html += 'X' + data[key].count;
        }
        html += '\n';
    });

    alert(html);