Yea this movie made some interesting decisions, to put it kindly. I've never understood the need to take an animated series and make it live action. I can see books and comics making sense, since live action adds more elements to them, but those are already present in animation.
On the actual painting, you nailed it. Toriyama's style seems to be one that comes naturally to you or that you practiced a lot. You're able to pull off clean lines and a simplified character design well.