Baneling Turnaround by Arkadius.deviantart.com on @deviantART
Viper (Starcraft 2)
Zerg Bane Creeper by ~Phill-Art on deviantART
Devourer by *Mr--Jack on deviantART
Concept art for the Deacon Alien by Ivan Manzella for "Prometheus" (2013). Early designs had the Deacon with a ghostly white patina to his skin, a far cry from the original Giger designs with their inky black armor and more biomechanical appearance.
VIRGINIE ROPARS Not sure if ball jointed but love the sculpting and the makeup on the doll.