Several of the original maps have some added topology on them, and I think a simplified hill shade could help pop the new ones in a similar manner. You can put

Several of the original maps have some added topology on them, and I think a simplified hill shade could help pop the new ones in a similar manner. You can put it on with something like 90% transparency and get a bit of a pop to add more depth to it. I used to do this back when I still made paper maps, but it should work just as well in a totally digital format. Edit: On the github readme the author addresses this some. General elevation data isn't in OSM, so it was deemed out of scope for this project.