If you are using Surface Layers for your color, you need to plug something into the Displacement input of a Surface Layer to get displacement ("relief", as you called it). The easiest way to do this as a start (though not necessarily the best), is to plug the Fractal Breakup shader that you already have with your Surface Layer into the Displacement input of the same Surface Layer. Initial results may be quite rough (the default Roughness in the Fractal Breakup is fairly high at 5), but you can either reduce Displacement Multiplier in the Surface Layer to 0.1 (to start, experiment from there), or you can reduce Roughness in the Fractal Breakup shader on the Colour tab to around 1 (again, adjust to your preference).
If you are already using Power Fractal shaders instead of Surface Layers for color, then literally all you need to do is go to the Displacement tab and check the Apply Displacement box, then adjust Amplitude, Roughness, and other settings to your preference.
There is a lot of experience and skill that goes into creating good surface shading, but that is the way you start to add "dimension", "relief", etc. to your textures.
- Oshyan