Coloring the skin. Coloring the face is actually not much different from coloring the hair and clothes, so I'll focus on the thighs.

Here's the base color.

Shade using the colors below, starting from the left-hand color and going in order to the right.

As usual, check opacity in the tablet options, and use tablet pressure to color.

Using the colors on the left, add slightly darker color for definition. Go lightly, so that the color doesn't end up too dark at the edges. Syringe colors and mix thoroughly using the soft circular brush. In steps 2-3, if you work as quickly as you can and get things done in one shot, it will look smooth, and you'll make your work easier.

Use this color (used in step 1) as a gradient around the orange circles, along the blue arrows. Also, make your brush thin and add light along the outer edges.

light

dark

Select the color from step 1 again. Set the brush to normal→overlay, and add light in the middle of each leg. Now the thighs are finished. This time we didn't color a very big area, but the idea is the same even with open legs, just with a larger area.