Okay so for the most recent one you posted, maybe try a few things:
1.) Blending the blush (a lot)
2.) Adding contour to define their cheekbones
3.) Replace the outline around the lips with maybe a dark red shading (I recommend the air brush)
4.) Contour and highlight the nose
5.) add eyebrows and shade the color of the eyes with another shade of green
6.) Shade around the dress and under the chest area with a dark pink or red
7.) Shade the arms and chest with a darker color and then add a lighter streak to highlight
