erynwells.me/layouts/photos/li_thumbnail_in_grid.html

{{- $thumbnail := partial "photos/thumbnail.html" (dict "Page" . "Width" 600 "Height" 600) -}}
{{- $thumbnail = $thumbnail.Crop "600x600" -}}
{{- $altText := $thumbnail.Params.alt -}}
{{- $numberOfImages := len (partial "photos/list.html" .) -}}
{{- $hasMultipleImages := gt $numberOfImages 1 -}}
<a href="{{ .RelPermalink }}" title="{{ .Title }}">
  {{ if $hasMultipleImages }}
  <div class="badge">{{ $numberOfImages }}</div> 
  {{ end }}
  <img src="{{ $thumbnail.RelPermalink }}"{{ with $altText }} alt="{{ . }}"{{ end }}>
</a>