Drawing on the Right Side of the Brain - Portrait - Isabella Brant

I loved this drawing, "Isabella Brant" (1621), by Peter Paul Rubens from the first time I saw it, so I thought I'd give it a try. I'm fairly happy with how it came out, although I see some problems in the left side of the drawing, and I wish I was better at shading. That's ok, because that's the next chapter of the book. I also seem to have problems with mouths, so maybe after I'm done with this book I'll focus on them for a while. We'll see.

I welcome any feedback anyone might have about how I might improve my drawings. Am I getting any better?