Final answer:
The act of drawing the mouth on the figure represents finding one's own voice and symbolizes individuality and the importance of self-expression in art.
Step-by-step explanation:
The symbolic importance of the last two sentences lies in the act of the character breaking away from imitating Aaron Douglas's signature style and beginning to draw the features on the face, starting with the mouth. This act can be interpreted as a symbol of finding one's own voice or individuality. By choosing to depict the mouth first, it suggests the importance of speaking out or having a unique voice, moving away from just following others and instead, expressing one's personal artistic vision.