Here are some step-by-step images that led to the final piece! Also, I wrote the poem:

Paint the sky green,

No matter what people say.

Because that is how you dream,

and how you dream is okay.

Color outside the lines,

There are no limits to imagination.

Let your hidden talents shine,

We celebrate all artistic creations.

The image portrays / represents the following artists:

Jazza

Vincent van Gogh

Pablo Picasso

Leonardo de Vinci

Andy Warhol

Michelangelo

Frida Kahlo

Jackson Pollock

Salvador Dali

Edgar Degas

Edvard Munch

Hokusai

Grant Wood

Frédéric Auguste Bartholdi

Jean-Honoré Fragonard

Walt Disney

Bob Ross

Charlie Chaplin

Makers of Passpartout

Makers of Where's Waldo

( In case images don't appear: https://twitter.com/Jevoro26/status/1160944754781085696?s=20 )