I couldn't find a recent post topic for this and didn't want to revive a super old one, but I wanted to share a really great resource for creators that wanted some examples of character sheets, storyboards, artbooks and production sketches. Even though these are from an animation perspective, they are quite useful in helping webcomic creators who are trying to find art resources regarding how to set up character design sheets, structuring story pacing or just seeing how the professional studios go about these things.
https://setteidreams.net/settei/