Hi @marek-234
Hmm.. what return value have you set for the image field?
You could just set it to return an image object then do this:
<?php $image = get_field('photo_1'); ?>
<img src="<?php echo $image['sizes']['large']; ?>" width="<?php echo $image['sizes']['large-width']; ?>" height="<?php echo $image['sizes']['large-height']; ?>" alt="<?php echo $image['alt']; ?>" />
