hey that sounds a lot like my comic! strong women, subtle romance, royalty of a sort.
There Was a War is about two young women on opposite sides of a bloody and confusing war older than the pair of them by far - Balor is forced to fight in the Fomor army, and Cath is a witch and prisoner of war at the Fomor keep. Slowly, as their separate worlds crumble, they try to build something new, something beautiful.
some of my favourite fantasy comics on here:
Your Worst Nightmare - beautiful colours and indepth, interesting worldbuilding, romantic sideplot and if not royalty, then nobles of some kind.
A Turn For Change - fairly typical fantasy setting, mainly about romance, really fun
The House on the Cliff - more of a modern fantasy than high fantasy, plays with some really cool concepts with beautiful art and iirc the two MCs are girlfriends
Witchy - forever witchy. i love this comic. really beautiful and original, with brilliant worldbuilding and great characters. i picked up on a romantic subplot but idk where it went.
all of these comics have strong female leads and mainly female casts