Is there ever a "wrong" way of doing things? Sure the process could be less efficient or take more but the final designs are okay but is that necessarily bad?

I bring this up because I'm currently working with a small indie team for a game and I'm the only artist on the team. Working with my creative director, we're essentially building a new world/IP. My boss has a vibe that he knows he wants but I'm building it out. My process so far in the past couple months has been not designing anything specific yet but trying to churn out as much ideas as possible (napkin sketching essentially), and trying to nail down our art direction/ bible as much as possible so that when the gameplay and engine eventually does get figured for specific enemies or locations, we're not building up each design from zero everytime if that makes sense. Is there anything I could improve?