This woman is ready for battle! Her bright green skin stands out against her black hair, which is pulled back in a tight ponytail. Her left arm pulses with power, and her body is clad in a form-fitting black and green bodysuit with boots and gloves. Across her chest are strapped a number of bullets, and a long sword is sheathed to her back. To bring out the visual element of the picture, I would suggest using variations of green and black throughout, keeping the complimentary colors of green and black at the center, while incorporating lighter shades of green and gray to emphasize highlights. Playing with differentiation of hues and saturation, and using different textures to give the picture a 3D effect, will really bring this character to life!