For drawing a map in space, from imagination, I looked at some images of planets and the moon for some ideas.

Paper:

Colored paper is a nice option.

In this case, I used Arches Cream paper. It is very gentle and not suitable for erasing, but I like it for pen drawing.

Light source:

When drawing a map, I decide on the direction of light and try to be consistent with it.

In the next example, I drew a rocky land with Mayan structures.

For the land, I looked at many images of rocky deserts and mountains.

For the buildings, I looked at Mayan buildings. Once I understand their anatomy, I can draw them from any angle, using my knowledge in linear perspective.

When drawing maps, let your imagination take over.

Planning, drawing some sketches first, and testing colors are the keys to success.

Once you tested and sketched your map, you can go for the final drawing with confidence.