Ember-data: Child data not being fetched when displayed in template

I have the following hasMany structure:

> listing event 
> -- artist 
> --- image

listing event has many artists, artists have many images

when displaying a list of listing events the artists are fetched accordingly - however because images are another level down they aren't. Totally get why.

However.

Say I am doing the following:

{{#each listingEvent in listingEvents}}

  {{#each artist in le.artists}}

    {{render "artist/artist-tile" artist}}

  {{/each}}

{{/each}}

And inside my render template I have the following:

{{#each image in artist.images}}

  {{image-helper artist.images.url 'c_fill,h_30,w_20'}}

{{/each}}

I would expect images to be fetched? How can I force the images array to get populated from the server? I assume this is because the artists were already a level deep when they were initially fetched. But I would also assume that by accessing the property the images would be lazy loaded?

I am obviously misinterpreting something here. Thanks in advance for the help smile