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To make a RPG terane you must start by laying out zones and areas.
These will be the basic areas in your RPG.
Now add your terane height to give it a 3D feel but make sure it is not too extreme.
Next you have to fill them in with more detail to the actual ground, blending atleast 2 different tiles to make it look less monotoned.
After that you have to put in the basic pathing orintated doodads and destructables since then you have your basic layout of the terane.
Now add your creeps, bosses, items, quests to the areas and your done a beta terane.
Next you must carefully add more pathing destructables where you think there should be one now (after you have tested it alot).
Then finish off by adding nonpathing based doodads for detail.
Your terane should be finished.
If you find something looks ugly, repeat the steps above but only for that area until you get your desiered results.