First draw your 2-point perspective cube in pencil with a basic grid over it.
Next take your eraser and start to take out individual or blocks of cubes. Attach the farthest, opposite corners of the erased boxes to the opposite vanishing point so that the interior walls are exposed.
Once you have a drawing that looks like the second cube below, determine which planes will be white, grey and black. Shade accordingly.
Your multi-faceted cube does not have to look like this one. In fact, it shouldn’t. Have at least 10 different interior walls exposed. If it is easy for you, do more!