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bathing fate/stay_night ladymarta line_art naked saber saber_alter saber_lily wet yuri

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The eyes make it obvious that one of them is saber_alter, but I don't know how we could hope to figure out the other two with only hair and facial expressions to go off of. Oh well. Presumably, it's saber and then either saber_lily or saber_extra, but they're just too similar (for obvious reasons).
Based on the hairstyle (note the unbraided hair tied with a relatively broad ribbon), I'd say the left one is saber_lily. But yeah, the one in them middle could be either saber or saber_extra. :/
Its saber. saber_extra has bright green eyes compared to saber and lily