Danbooru-based image board with a specialization in high-quality images.
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caro_ru_lushe fixed mahou_shoujo_lyrical_nanoha mahou_shoujo_lyrical_nanoha_strikers screening subaru_nakajima teana_lanster

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Image already has been rasterized, seems like someone doesn't know what screening actually means. It may look like "screening" due to the slight sharpen filter I've applied. Tag removed.
Care to suggest the 'correct' fault tag for your upload then?
This is definitely a screening artifact. Sharpening tends to enhance screening.