Making a random portrait using two tones

Hello everyone, it has been a while since I drew a portrait, so I decided to make a random one for tonight. Why random, because I didn't use any reference, using only the power of imagination. Using a picture is recommended for portrait, but I just didn't feel like using one.

I like to use the two tones technique as well. If helps me to get better (slowly but surely) with getting all the shades and highlights right. Granted, a reference image is quite handy for this, but if I don't practice making them up in my mind, well, I will not get as much satisfaction as I would like...and I like that feeling 😅

Here are some progress pics

I hope you guys like it, thanks for the view.