I can't remember- most likely I did some digital portraits! I may have taken one of my drawings and worked on it digitally- that's more my style -though I do have a graphics tablet and pen, but I prefer to draw freehand with a pen or pencil (old school-lol).
Skin texture? Not sure which bit oft his drawing you mean as there are smooth sections and more textured sections, but i alternate the way I hold the pencil. I may use the side of the pencil or graphite stick to apply block shade and then draw into it with an eraser. I also apply different pressure to my strokes and mark making to create stubble and fine lines on the skin. Hope that helps.