Sorry for taking so long to answer this, and thank you for the compliment. Hopefully whoever this is will see it, also if not hopefully you guys will be interested in this answer. My main advice is just practice and seeing how other successful artists have accomplished painting the figure. As for good tips that I’ve learned: always remember to turn the flesh by handling reflective light and dark tones as the skin turns into the background. Also remember to deal with a hierarchy of light. For example if your lighting is from the top always darken the skin as you move down the figure because even if it seems as light as the top it is most likely a trick on your eyes unless you have another source of light. Lastly about flesh tones, this is where practice is the most important. Just by mixing a lot and doing a lot of color templates and wheels you can understand how to mix paint. You really just need the experience especially because it depends on what type of paint and what brand you use. Books can help but being able to intuitively mix just takes time. For figures and portraits I usually try to mix somewhat neutral flesh tones with different values. Then depending on my figure I give highlights of color where they are needed such as reds, blues, greens and yellows. I pre-mix the neutral tones because I use them as a value scale but most of the highlighting I mix while I paint. I hope that helps, good luck!