Think of a girl, and also think of some horns. Now think of the two at the same time, and perhaps attach one to the other. Horned girl (角娘) refers, presumably, to whatever you have in mind at this point, unless you put the horns in the wrong place. Horned girls are a subset of horned person (and should you wish to discover the meaning of 'horned person' you may follow similar instructions to those already laid out, but with a person rather than a girl), to which you might be made to believe there was more art of horned people than of horned girls, but that is not how this website works. Hope this helps.