I built mine using Squarespace, it’s a popular option but has annual running costs
That was the one I was looking at. I think it will fit what I want but it is quite pricey.
Is it easy to manage?
My wife created a site for herself with Wordpress.org. It's more of a blog rather than a photo site, and she seems to spend more time administering it rather than posting content (and I was a Unix System Administrator in a past life). It may be more complicated than you want, but it does allow a good degree of flexibility.