That's not exactly a custom, but a paint job.
It is a model kit of the ALIEN from "Independence Day (ID4)" which I assembled months ago and only now I got painted.Materials: Superglue and matte vinylic paint.
Major painting technique: Drybrushing.
Note that on one of the sides I did a yellow drybrushing effect to emulate the sunset light on the alien. I am not sure if that is visible on the photos, but it looked very cool in person…
That is amazing!!!!!