I dont know if I'm late to the post, but I'm gonna open my, by light years, favourite artist around there. 2 MINUTE TABLETOP. ( <a href="https://www.2minutetabletop.com/" rel="nofollow">https://www.2minutetabletop.com/</a> ) This artist, this lord of maps, this beast, this monster, this sacrifice to the light, this GENTLEMEN gives away most of his maps FOR FREE. Not only that, but he has a huge load of assets, an incredible and stunning colection that you can upload to your roll20 library and build the maps to your liking because what he basically do is let you build your map as a puzzle using the pieces as if you were drawing the maps with his style. Of course, you cannot sell the maps you do with this method, since he gives away for free the assets just for your own games or sharing them for free. Here, see what you can do with the material, these two are from my own, using the assets mentioned above.