Hi @Manuc
Yes, this is an easy task that you can accomplish with the following code:
<?php
$map = array(
'Very simple' => 'url/to/image.jpg',
'Simple' => 'url/to/image.jpg',
'Normal' => 'url/to/image.jpg',
);
$value = get_field('field_name');
$image = $map[ $value ];
?>
<img src="<?php echo $image; ?>" />