Answer:
Holds that from the inside, any system looks natural and coherent, but it is in fact filled with unseen contradictions, myths, or stereotypes. Jacques Derrida introduced the idea of deconstruction.
Explanation:
Mary Cassatt's mediums included painting, oil pastels, and drawing. She usually combined the light color pallet with a loose brush and was often inspired by Japanese art.
Answer:
The easiest thing to do in you situation would be to use references from other drawings or real pictures, and make sure you use a consistent light source. Sorry if this doesn't answer you question but these are some tips.
B.) Foot pedals change "The Pitch" on a Timpani on the Instrument.
Hope this helps!