How does entity_metadata_wrapper work with array?
The function theme_image will output the value as an img-tag. Is that what you are looking for?

$photo_field = $wrapper-&gt;field_library_photo-&gt;value();
$image = theme('image_style',
  array(
    'style_name' =&gt; 'large',
    'path' =&gt; $photo_field['uri'],
  )
);