This was intended as an under-painting for acrylic (it's acrylic paper) but I didn't want to ruin it if it was too much for the paper. Either way I like this undeveloped

Underpapers: Inadvertent, Unintentional Marks

Fluid Acrylic Failures - Creating Fluid Acrylic Paintings

Donald Fox - Blog: creative process

Underpainting with Acrylics: How To do It and Why You Should

Underpainting Technique / How to Start a Painting / Acrylic

Underpainting in Oil and Acrylic - Jackson's Art Blog

Fluid Acrylic Failures - Creating Fluid Acrylic Paintings

Craft Essays Archives • Cleaver Magazine

Underpainting in Oil and Acrylic - Jackson's Art Blog

When does an artist know when to stop painting a picture? Is it

Why You Should Do an Underpainting for Acrylics - Trembeling Art