Async Art Masters can be embedded anywhere on the web, including email signatures. Once embedded, the image will always reflect the current state of the artwork.
How to embed Async artwork in your Gmail signature
In the top right corner, click the gear icon to open up the settings menu then click "See all settings".
Scroll down to "Signature".
Click the "Insert Image" icon.
Then click "Web Address (URL)".
Paste in the Master's Direct Link, which can be found by clicking "Share" on any Async Master page.