Crossland makes big maps with a good amount of detail. Usually with a single theme. https://www.patreon.com/crossland
Crosshead is the related project and they have good assets for dungeon draft.
Czepeku makes very detailed and expressive maps that tell a whole story. They are fairly fantastical and I use their website's map search to find inspiration. https://www.czepeku.com/
I've been looking Darkest Maps lately. They've got good horror and eldritch stuff while also a bunch of standard fantasy. https://www.patreon.com/DarkestMaps
2 Minute Tabletop is great for simpler designs that tend to be less cluttered and a bit more rough and low poly on line work and detail. But they still look great. https://2minutetabletop.com/
Cze Peku are great! The worst part of Patreon is Patreon having carefully crafted the single most frustrating UI for finding something specific from the people you subscribe to. CzePeku's website gets around Patreon entirely, letting you just search their site for a link to the map download page.