(Masterpiece, Beautiful Details, Perfect Focus, Uniform 8K Wallpaper, High Resolution, Fine Texture) 
 (1  girl,  mermaid , antro, but with  human skin, with long dark straight hair), :BREAK: /
 || (with gills   on the ribs closer to the lungs,)  (the ears will most likely be of some unusual shape, maybe with membranes between the cartilages),
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 (the skin is pale, possibly with a bluish or blueish tint), ((eyes are narrow and long like a cunning fox)), (fingers with membranes and long nails, possibly with darkening at the ends), most likely the first or second breast size, (the colors on the tail are such, typical fish, like gray with a blue tint, the tail itself is long, especially the fins), (an unusual mouth that opens wide like monsters). 
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Maybe there will be shades of red on the fins and elsewhere, for emphasis), standing, cowboy shot, action shot, standing, cowboy shot, action shot