There are a lot of amazing creators on the Marketplace, and I would like to suggest several of them solely because there are a lot of them that go unnoticed and I feel like there are some breathtaking artists out there creating all sorts of different styles. Some of my favorites include Mr Valor, Moonlight Maps, Ori the Cartographer, StainedKarbonMaps, Czepeku, Tom Cartos, Gabriel Pickard, Mythic Portal Games, Mik and Wewa, Venatus Maps, Zach Moeller, The Mad Cartographer, David Hemenway, Domille, Caeora, Misjay Maps, Dan DiPietro, Forgotten Adventures, Dungeon Baker, Divination Illustrations, Russ Hapke, and really, there's a whole lot more than those. I would also include myself in that list as well, because well... I like my maps, and I create a lot of them :P There's also the style you are looking for. There are a plethora of talented creators on the Marketplace, and a lot of artists have their own styles, and some mesh well together better than others, but I promise you, there is no shortage of talented creators on the Marketplace, and there definitely is not a shortage of maps that can be used as either a ready to go 5e Dungeon Map, or Tile Sets for custom creating your own dungeon maps.