nice poser work,
i have a few comments if you dont mind, in each one the camera angle is more or less the same, try playing around with some tighter angles etc , drop the camera down to an extreme etc, add in some HDR lighting etc
some imperfection in the textures , the skin for one is important to break up the smooth perfect finish, try some matting of the surfact in limited amounts , it should help break things up, do it as a after effect in photoshop if needs be ( it can be quicker from the 3d what the 3d heads i know talk about) this can alos apply to the surface shape of things like the spawn of evil etc , perfect smooth shapes can look unnatural even with metal.
the other is the amount of folliage in the peices , dont be afraid to " over do it" since you can always pull a few of the fiber objects or leaf objects after wards.
please dont take what i say as negative , i like what i see but i think it can be pushed farther and each step forward is a good one in my mind at least.
keep up the work.
j mac