I use "shape form shading " for photos
an example from a different forum i posted a bit back

textured and mesh only


this is the original image
http://photojournal.jpl.nasa.gov/catalog/PIA19899

http://photojournal.jpl.nasa.gov/jpeg/PIA19899.jpg

but this dose not work well for most hand drawn things

some can be done ,after a bit
https://www.cartographersguild.com/s...l=1#post262058


a dungeon type map ?

start with hand painting a displacement map

there are some tools that ?? say ??? they can convert a image to a normal map ???
-- they DO NOT really work well except for a few things
like crazybump and "NormalmapGenerator"
http://www.crazybump.com/ -- NON FREE
http://crazybump.com/buy.html

https://github.com/Theverat/NormalmapGenerator