Dropzone.options.myAwesomeDropzone = {

  paramName: "file", // The name that will be used to transfer the file
  maxFilesize: 2, // MB
  parallelUploads: 1,
  success: function(file, response) {
    var imageSrc = response;
    $(".img-responsive").attr('src', imageSrc);
    if (imageSrc == '/assets/images/offerfeatimg.jpg') {
      $(".removebutton").hide();
    } else {
      $(".removebutton").show();
    }
  }
};

success: function (file, response) {
   this.removeFile(file);
}

Dropzone.options.myAwesomeDropzone = {
    paramName: "file",
    maxFilesize: 2,
    parallelUploads: 1,
    init: function() {
        this.on("success", function(file, response) {
            var imageSrc = response;
            $(".img-responsive").attr('src', imageSrc);
            if(imageSrc == '/assets/images/offerfeatimg.jpg') {
                $(".removebutton").hide();
            } else {
                $(".removebutton").show();
            }
            this.removeFile(file); // This line removes the preview
        })
    }
};

.dz-preview, .dz-file-preview {
    display: none;
}

Dropzone.options.myDropzone = {
    paramName: "file",
    maxFilesize: 2, // MB
    url: 'post_image',

    createImageThumbnails: false, // NO THUMBS!

    init: function () {
      this.on('sending', dz_sending),
      this.on('success', dz_success),
      this.on('error', dz_error),

      this.on('complete', dz_complete) // Once it's done...
    }

function dz_complete(file) {
  $('.dz-preview').remove();  // ...delete the template gen'd html.
}

success: function (file, response) {
      file.previewElement.innerHTML = "";
 }

<div class="dz-preview dz-processing dz-image-preview dz-complete"></div>