Alien, Xenomorph sketch

I drew this in my sketchbook from my art class the other day. I say sketch because I didn't do a full body of Alien, or add all its details. I'm pretty proud of it though, because I did this in less than 40 minutes, since I got it finished before my fifth period ended. But I was inspired to draw Alien because I've been playing Alien: Isolation lately. Still haven't beat it though.  I own this drawing, but I do NOT own Alien.  Check out the movies it's in, and the video games. They're pretty good.