These are some experiments with shading on fabric. For the bunny I used Inktense pencils, layering them to get the depth and values I wanted. The egg was painted with acrylic inks. Both worked well for shading objects, they can be used on paper or fabric, and are both permanent on fabric.
While the inktense pencils could be used darker, and the acrylic inks diluted, they do have their own natural intensity the way I use them.