Syntax: integrate image widget in costume widget

Can someone help me with the syntax? Some how it does not work:

<div ng-init="imagemodel= {image_source: 'image-item', item: config.doorbell_image, refresh: 1000}">
   <widget-image ng-model="imagemodel"></widget-image>
</div>

Thank you.

My mistake was in image-source:

image-item

instead

item-image