I think you did great! You can apply the same concept of thinking in terms of planes to this portrait, though it is a bit more complex than the pear. It helps with organizing your value shapes to keep things as simple as possible at first and moving into more complex shapes. Hopefully this graphic helps. You did a great job with your shading and made some good decisions with your shapes. Overall I think they can be simplified just a bit more, paying close attention to the planes that are facing towards and away from the light source.

The shading looks smooth. Maybe try simplifying the shapes a little more. You want to consider the planes of value rather than the lumps and details.