Thanks for the compliments and constructive crticism.
By skin tones, do you mean the brightness or the color? So that I know in the future, which specific pictures have this problem?
The first pic of the second girl was lit with a ring light, but not a ring flash. I used a silver reflector behind her for a background as I liked how it reflected but still left some of the silvery sheen showing in areas.
In the second one of the second girl, I used a 50mm Nikkor lens 1.8f with a warm filter. The lighting is natural light from a window, with a white photoflex disc below her chest