Sample code to get contact picture

// The scope of 'this' is the event. In order to call the 'receivedEvent'
// function, we must explicity call 'app.receivedEvent(...);'
onDeviceReady: function() {
    app.receivedEvent('deviceready');

    function onSuccess(contacts) {
        alert('Found ' + contacts.length + ' contacts.');

        console.log(JSON.stringify(contacts));

        var image = document.getElementById('contactAva');

        // assume there is a contact with photo, but normally we should check for
        // contacts.length and .photos.length
        
        var photo = contacts[0].photos[0];
        
        image.src = photo.type == 'url' ? photo.value : ("data:image/jpeg;base64," + photo.value);

    };

    function onError(contactError) {
        alert('onError!');
    };

    // find all contacts with 'Bob' in any name field
    var options      = new ContactFindOptions();
    options.filter   = "Pronin";
    options.multiple = true;
    options.desiredFields = [navigator.contacts.fieldType.id, 
        navigator.contacts.fieldType.displayName,
        navigator.contacts.fieldType.photos];

    var fields       = [navigator.contacts.fieldType.displayName, navigator.contacts.fieldType.name];
    navigator.contacts.find(onSuccess, onError, fields, options);

},