Wow… doing these cuties, but it’s taking forever to make it a deeper skin tone. Trying yellow ochre, burnt sienna tomorrow…
Try red, yellow and blue washes. It does take multiple layers but you have more control over the final outcome.
I am not great with darker skin tones, but I agree with @jeanhai that’s the method I use as well, with some washes of burnt umber as needed also. I don’t know how dark your wanting to go, but I think it’s looking good so far, especially the limbs in the middle photo look phenomenal. I know doing so many washes takes forever, but it’s really the only way to get a darker skin tone that still looks translucent. That I know of anyways.
This looks great!