Once you draw some basic things with the drawing tool, like rivers or roads, or perhaps a green blob for a Forest.... I would highly recommend that you go into the Roll20 Art search. It contains both Marketplace (paid offerings of graphics within Roll20), and also access to FROM THE WEB search results which gives you graphics that you can drop on your page for free. Example: Draw a green blob shape with drawing tool for a Forest. Then go into Art Library Search and type "Trees" or "Forest", and change the drop-down menu between Tokens, Maps, and the "Everything" setting. Find a tree or forest-art that you like, and drag it from the Art Search onto your Map Layer, on top of the green blob. The green blob becomes your Forest borders and background, while the actual graphic of Trees makes it pop, and makes it recognizable as a forest at a glance. It can still be a very simple doodle-style map, but some small bits of free art From The Web can make it better. Since your map is 20 miles, this scale is possible to see the roofs of houses and such, so you can search for little icons for Houses or thatch roofs, barn, fence, foothills, cave entrance, or whatever details you want to add. Wiki Docs on using Art From The Web on your map, <a href="https://wiki.roll20.net/Art_Library" rel="nofollow">https://wiki.roll20.net/Art_Library</a>