For pastel and watercolor practice, respectively.

Kittens

 
I used light staining colors for this painting and then lifted out the trees shape.

negative painting, wc, wet-on-wet

With the exception of the dark blobs on the top rt bush, I'm, pretty happy with this. After I took this picture, I lifted off the brown and added more color and green.
wc practice, beach, sky, water and dunes

watercolor practice

watercolor practice, water, reflections and negative shapes

watercolor practice,

WC practice, using wet-on-wet

wc practice, wet-on-wet, background and fog