Building technique Recommendations

Hi all, I am new to the sub/Reddit overall so please excuse any Reddit “mistakes” I might make. I am building a Lego Pirates of the Caribbean MOC (rather more a diorama-like scene that combines legitimate Lego sets, while the background is something that I personally designed). It is my first attempt at ever creating a custom Lego scene. It is inspired by the Pirates of the Caribbean Disneyland ride, specifically the part in which the Wicked Wench storms a castle-like fort. As you can see in...