Frida Kahlo initial drawings

I want to draw all of the artists in the same style line drawings. I will then colour them digitally. Here are the original drawings that I did of Frida Kahlo. I think that the first and last drawing  work well but I'm not too keen on the second drawing, I think that the face shape is too round because of how I have drawn the jaw line. I do like the head dress on the second drawing so I might end up combining it with the first drawing. As these are just initial sketches the final image might change slightly from what goes into the book. The next step is to clean the final drawing up on photoshop and colour it digitally.