This is a piece of artwork I used to own, but it went the way of financial need about 13 years ago. I’m pretty sure it was done for Ruby-Spears. Gil worked for them around 1985-88, often on the same shows as Jack Kirby (Centurions, for example). It’s Gil’s own inking, but no idea on the colours—maybe Gil himself (definitely not Jim Woodring, as I mentioned here).
If anyone has any other info on this piece (for instance, what the show/idea it represents was), lemme know!