Warmup Mud head (45min) and Zbrush head(1 hr)

This is how i typically approach a 3d sketch. I sculpt in a process similar to my head sketch drawings. No reference of course (exercise for the mind and hands) Done Entirely in Mudbox.
total time 45min.

Software used: Mudbox

Haven't done this in a while, So this is my first cube sculpt in Zbrush. I finally feel comfortable using zbrush to sketch.

Software used: Zbrush 4