{{ $thumbnailResourcesNames := slice "thumbnail" "Thumbnail" "thumbnail.jpg" "Thumbnail.jpg" }}
{{ with index .Params "thumbnail" }}
    {{ $thumbnailResourcesNames = $thumbnailResourcesNames | append . }}
{{ end }}

{{ $imageResources := .Resources.ByType "image" }}
{{ $photos := where $imageResources "Name" "not in" $thumbnailResourcesNames }}

{{ return $photos }}