Stunningly beautiful WC!
In the USA - parsley ( persil ) is not often used for fajitas...But it is a great flavor option. Most often - the leaf of the coriander plant (cilantro) is used, along with other Latin American flavor ingredients.
I really like the twist you did in this cook - I think it is a nice, fresh approach that focuses more on the flavors of the meat, with the other flavors as accents.