Creature head designs

Last week I watched Alien 3 again and I was inspired to create some creature designs.
Before the drawing stage I gathered a lot of references of animals and bugs and I tried to
integrate some of their looks on my designs. I also realized that it is very hard to create something new because there are 1000 of films and games that have that kind of stuff.
In the beginning I had allmost 100 head sketches but I ended up using only half of them.
Hopefully you guys will like some of them...  :)