The grotesque witch concept art from Hansel & Gretel will probably turn you on
This women in the picture is an alteration of a witch from the film Hansel and Gretel. It is very well done to show the evil. Normally you view witches in a certain way but what this does is follows from the film and puts them as normal but pure evil at the same time.
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A hoodied assassin, dual weilding daggers. Striking fear among enemies with the weapons and the mask. The mask shows no emotion and could've been earned through training, showing skill within the character. Also the hood shadows the mask making it more menacing to look at striking fear.