Acrylic b/w portrait sketching

I´m having fun with quick and small black and white acrylic sketches in my sketchbook. Not perfect, trying to play with brushes, focus on simplifying the form and values.




Acrylic sketch self-portrait

Trying to practice with acrylics and focusing on values. I was using only Titanium white and Mars Black paint (and their mixes gray).
It was quite quick sketch on paper (in my sketchbook) with quick pencil line art,  it´s rough and messy, but I like it...