Grisaille or Grissaille painting

Hello!  Hope everyone had a lovely weekend:)  I had a wonderful relaxed one with the husband!  I just wanted to pop in and show you a little grisaille painting I am working on.  Grisaille or Grissaille...I have seen it spelled both ways!  A grisaille is basically a value underpainting that can be glazed over with color.  I love this technique and am currently having my painting classes do this for their first "real" project this year.  So here is the beginning of my grisaille:

Once I finish it I will post the end results:)  I am so excited to glaze color over it though!