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Pfft, cosmetic difference are only outwardly. Your still thinking creatures. I'd say that puts you in the same boat.
You're still using the same line width on the backgrounds as the characters, and I'd be careful with that. Here, the backgrounds work because the line types are different - curves for the characters, straight lines for the background. Where you have more organic backgrounds, I recommend using line width to differentiate the planes (background/midground/foreground).