Really great start indeed! Try the dodge and burn as suggested but explore the techniques using curves layers instead of overlaying 50 percent grey layers. They are much more versatile as they work like masks and are totally editable.
There are also some frequency separation techniques to preserve the textures while editing the colors only. This will allow you to change saturation, adjust contour strengths, etcetera
Hope this gets you on the right track. Let me know if you have questions .
Mr. Human Canoe