These are called skins. You use a stencil and go over it with light molding paste on your mat. Let dry depending o…
Getting Dimensional with Modeling Paste - Carolyn Dube
This is a lightweight, flexible sculptural gel for use in thick applications where weight is a factor. Light, airy, and easy to use, it holds shape
LIQUITEX Light Modeling Paste
All About That Paste! - Prima
How to use modeling paste with a stencil
Modeling paste + watercolour technique for mixed-media
Modeling Paste VS Gel Medium
Lezley's Art Tutorials: Applying Molding Paste Art techniques tutorial, Cross art painting, Mixed media art canvas
Modeling Paste by Artist's Loft®
Modeling paste technique for creating texture.
Colored Modeling Texture Paste - DIY, Easy, Cheap - Textured Whipped Paint Effect - EXTRAS
Help! Acrylic + modeling paste : r/Artadvice
Tuesday Techniques – Stencils Part 4: Modeling Pastes
All About That Paste! - Prima