I used a Marvel Select comic version of Black Widow. I just made her my own not based on any particular design. First I repainted her face, hair, and sections of her black costume added red cobra symbol and red detailson the seams. I also added a 4 vinyl straps to her leg and shoulders then detailed the top with silver red accents. Her belt is a vinyl strap with a random arrow part I found and red crystal. The glasses were made with vinyl and clear plastic with red accents. The last thing I worked on was her sword I just pictured Storm Shadow teaching her to use one I used a silver plastic sword put metallic tape on the blade then painted the hilt and added red thread and a red crystal.
It took a lot of time waiting for drying and then spray sealer but she came out really cool much better than her original version. I have her for sale on Mercari.