Middle C (the fourth C key from left on a standard 88-key piano keyboard) is designated C4 in scientific pitch notation, and c′ in Helmholtz pitch notation; it is note number 60 in MIDI notation.
A critique is honestly just your opinion on the work, also you didn’t put any pictures of the pieces of art so no one can actually answer this for you :/
This would be described as a "separate or natural" example of self-portraiture painting, provided that Jesse creates a natural likeness of herself in her given style of painting. Other categories are historical inserted portraits, where one inserts their likeness into the character of a historical figure, inserting oneself into a group portrait and other portraits created with related objects in the image field.
