In your case you have a repeater inside of a group. To add to this you are trying to get an image field and I don’t think shortcodes will work with image fields, but I’m not sure. In any case you need to use
// acf repeater row indexes start at 0
[acf field="{$group_field_name}_{$repeater_name}_{$row_index}_{$sub_field_name}"]
