Question

how I can make these structures in my model

Answer 1

Hi! If you are referring to the big cylindrical structures at the back, you can make those by molding clay/dough and heating them up to make it hard. This could be liken to the structure of a volcano so that structure is possible using those materials. You can watch this video: https://www.youtube.com/watch?v=7DoO-b92nEE hope this helps!