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Maybe some smoothing vector art on the people drawings would complete the look, like perfect circle/oval heads, and would help contrast against the emaciated look of Anna.
Also, try giving Charles a self-pitying plain sad face, as if they're oblivious to the suffering of others. It doesn't need to have an angry face, which comes off as a bit too on-the-nose, did-you-notice-this-is-the-villain cliche propagandising.