watercolour study of tones using only Payne's grey

I did a  study of mostly white ojects and one dark object by using only Payne''s Grey watercolor paint.
That is such a good excercise for me.
Furthermore some parsnips, this time with color but again to learn to see tones.
I did these excercises for the online course of Julie Douglas. She is such a darling and such a great tutor. I learned so much from her and she gives me time after time such a support that I get motivated all the time. Just what I need:-)