--- a/qrurls/admin.py	Wed Nov 05 10:27:01 2014 +0100
+++ b/qrurls/admin.py	Wed Nov 05 10:35:51 2014 +0100
@@ -155,7 +155,9 @@
         #image = forms.ImageField()
 
         # Existing URLImages
-        url_images = forms.ModelMultipleChoiceField(queryset=URLImage.objects.all())
+        url_images = forms.ModelMultipleChoiceField(queryset=URLImage.objects.all(),
+                widget  = forms.SelectMultiple(attrs={'size': 20}),
+        )
 
     def import_images_handler (self, url_feed, data, images=()) :
         """Custom for backend for mass-importing images into a feed."""

--- a/qrurls/templates/admin/qrurls_import_images.html	Wed Nov 05 10:27:01 2014 +0100
+++ b/qrurls/templates/admin/qrurls_import_images.html	Wed Nov 05 10:35:51 2014 +0100
@@ -48,11 +48,12 @@
                         <label for="image">Images</label>
                         <input type="file" name="image" id="image" multiple="multiple">
                     </div>
-                    <p class="help">Selecting multiple image files is possible.</p>
+                    <p class="help">Upload new images. Selecting multiple image files is possible. The order of images will be randomized.</p>
                 </div>
                 <div class="form-row">
                     {{ form.url_images.label_tag }}
                     {{ form.url_images }}
+                    <p class="help">Select multiple existing images to re-use them. The order of images will be randomized.</p>
                 </div>
             </fieldset>