I am picking up on images on twitter as references for sketches.
This was a short drawing of much admired, amazing 20th century artist Frida Kahlo. this is on the great twitter stream @womensart1 by artist PL Henderson.
Charcoal on white paper with background coloured on photoshop.
kestrelart 
Cant wait to see the sketch done with your dominant hand!
I think that you draw equally well with both hands… and perhaps even better with your non-dom hand…I wonder if it’s something to do with using the other side of your brain?!