terraforming/decor tips?

[PugLovex]

hihi! my island is currently progressing a lot, but i wanted to come onto here and get ideas about terraforming. my island is a bit lacking in terms of terraforming (buildings and areas are mainly all on the first level), and i wanted to know if anyone has any good tips for how they terraform or felt like sharing some of their terraforming pics for inspiration. anything is greatly appreciated!!

also, i wanted to ask about ideas/tips on filling smaller gaps on the island as well. if you have any ideas or inso pics, again anything is greatly appreciated!!