Strictly IMHO, but I think that the rocks/mountains look too flat.
You should pick a style that you like to indicate ridges and peaks and height.

The shadow pattern on the green background also disagrees with the roadway's suggested slope, but this is probably irrelevant since buildings will probably cover almost all of the green.

The city topography would lend itself to an isometric or perspective rendering, but that is a whole different level of technical skill. The isometric mapping tutorials might help you get started if you choose that direction.

Ultimately, I think that it will fall to shadows to convey the rising terrain. One consideration is how much it rises from one switchback to the next and how it rises. If retaining walls allow one building to be built against another building further upslope, then the yet-to-be-drawn buildings and their shadows will convey height. On the other hand, if the buildings are separated by rocky cliffs, then your roads will need the rock slopes drawn between the terraces.

I hope that helps.