in this post, I'll show you how to loop images in Twig and dynamically adding image styles to them in Drupal 8.
{% for item in content.field_images['#items'] %}
{% set image = {
'#theme': 'image_style',
'#style_name': 'medium',
'#uri': item.entity.uri.value,
'#alt': item.alt,
'#width': item.width,
'#height': item.height
} %}
{{ image }}
{% endfor %}
