{{ $src := .Get "src" }}
{{ $classes := .Get "class" }}
{{ $alt := .Get "alt" }}

{{ $image := .Page.Resources.Get $src }}

<figure class="{{ $classes }}">
  {{ if $image }}
  <img src="{{ $image.RelPermalink }}" alt="{{ $alt }}">
  {{ end }}
  <figcaption>
    <p>{{ $alt }}</p>
  </figcaption>
</figure>