The following links might be useful pre-thinking, especially the last one.
The truth about human nature: human or individual? (Google Arts and Culture)
An animal instinct (Google Arts and Culture)
The art of coexistence: man in the realm of nature (Google Arts and Culture)
Human nature: the survival of the fittest
Desires and societal expectations
Instinct expressed through visual arts (Google Arts and Culture) - an interesting read with art examples
LOVE ME OR KILL ME by Sarker Protick
See the rest of the instinct-related articles with associated art
The Colors of Feelings from Thomas Blanchard on Vimeo.
Art work using animals:
Drawings of animals
Animals in art (many examples) on Flickr
Barcelo, Miguel (1957- ) - 1999 Floquet de Neu (Christie's Paris, 2009) Mixed media on canvas.
Using colour to express emotion
The science of colour explained by art.
All about colour (libguide)
Pablo Picasso, 'The Tragedy', 1903 (oil on canvas)