Handplates page 1, I guess. Also, you can see Gaster glow yellow here - his natural color - so that's something (Not like you'll see him glow a lot, since we can't see his face most of the time lol)

Handplates by Zarla
www.deviantart.com/zarla
The Page:
www.deviantart.com/zarla/art/Anesthetic-s-for-babi…

Gaster voice: ‪@thatonedude0315‬
Editing: ‪@Kgharry13‬
Sound effects and Music from Black Mesa and Portal 2
Portal 2 Ost - Haunted Panels