The V4 update and its predecessors often include other Trevor Henderson-inspired creatures:
BendytheDemon18 completely rebuilt the core engine of this add-on for the V4 release. The most notable upgrades include: Siren head addon V4 -RP- by BendytheDemon18
If you want a solid Siren Head for roleplay or horror maps, V4 is worth downloading. Just be ready to tweak settings and test compatibility. The V4 update and its predecessors often include