Your charcoal drawing is absolutely marvelous, my compliment! I started to draw portraits too meanwhile, though I am only working with pencil. Drawing so lifelike with charcoal as you do is truely remarkable.
May I ask what you charge for such a portrait with charcoal and how you sell them?
Thank you so much!

I think you can also draw a life-like charcoal drawing like I do. Well, I have been making colored pencil drawing like you but it seems like it didn't fit my drawing style, I am poor at blending hues to achieve a correct tonal values that is why I practiced monochromatic drawings like graphite and charcoal. I started also with pencil then I switched to charcoal using dry brush technique to achieve realism. It is much easier to manipulate compare to coloured pencils.
Normally it depends on the size. And it is much cheaper compared to coloured pencil drawings. That is why I like coloured drawings.
For letter size I usually set a price of $30
11x14 inches $50
It ranges from 30 to 100 USD..
I usually sell it on my digital space, normally those who request commissioned portrait are just my neigborhood. LOL