graphic assets license

Hi, some time ago I've reimplemented the EE hud for GZDoom using SBARINFO.

I've shared it here as part of my MimicHUD mod.

Now I'm planning to publish it on GitHub.

Since it uses lumps taken from here:

https://github.com/team-eternity/eternity/tree/master/base/doom/res/graphics/newhud

I'm here to ask for permission and for details about the licensing I should use.

GitHub shows that your project uses GPL3 and a custom license.

Which one covers the assets I've used?

Thank you!

Heya, I am the one who did the art for the EE hud. I would be fine with a CC BY-NC-SA 4.0 license being applied to it.