White swallow all around

Yesterday afternoon I drew these birds on white paper. Charcoal and gouache all around, four times. Drawing: 1.5 x 1.5 inch (4 x 4 cm).

White on white

 One coat of white gouache all around later

 Two coats of white gouache all around later

 Three coats of white gouache all around later

 Four coats of white gouache all around later

I like the smell of gouache.