Cool sketches! I like the second one, although I would try to get the camera angle a bit more dynamic, maybe lower it at ground level, have it closer to the scene so it's more a cinematic perspective rather descriptive.
I am going to move your thread to the 2d section of the challenge if you don't mind
great to see a 2d entry..
i really like both of your sketches.
i agree with pascal, about the dynamic view. in the first one it could also be cool to have the camera closer to the action. maybe a shot from the left wing of the human aircraft, pointing down at the alien.
I know it's a drastic change , and you don't have to go this far, but I thought it could be interesting to be closer to the action. Maybe just do a very rough sketch just to see if a new perspective could serve your purpose better, don't spend too much time on it if it's not working though. Just talking about exploring another angle