He made numerous sketches of her sitting in a rocking chair in the years when her mental illness progressed. (widewalls.ch)
Like previous works, these begin with numerous sketches. (paceprints.com)
Although she does not devote herself to painting en plein air, her work develops from direct observation taken down in perfunctory drawings or quick charcoal studies on the pages of numerous sketch books that also contain countless color studies and charts exploring how certain hues might work individually and together. (hamptonsarthub.com)