Help! What’s the best way to get photos changed into royal portraits? ISO App recommendation and prompt

Hi! Totally a newbie to this and just trying to make a fun project. I’m looking to make pictures of friends and family into royal portraits. I’m looking for the best website recs/apps to do this and best way to prompt it. All the apps I used looked bad. So any advice is much appreciated!

aipromptprogramming app apps family fun photos portraits project prompt recommendation website