Use this code to pull image alt/ title content automatically from advanced custom field image.
Set as:
<?php $image = wp_get_attachment_image_src(get_field('FIELD_NAME'), 'full'); ?>
<img src="<?php echo $image[0]; ?>" alt="<?php echo get_the_title(get_field('FIELD_NAME')) ?>" title="<?php echo get_the_title(get_field('FIELD_NAME')) ?>" />
Another route (using image array, repeater/ flex layout):
<?php $image = get_sub_field('FIELD_NAME');?>
<img src="<?php echo $image['url']; ?>" alt="<?php echo $image['alt']; ?>" title="<?php echo $image['title']; ?>" />