Interesting concept, but I think it needs lots of work.
You should probably add a proper corpse to the model and rename the 'Decay' animation to 'Decay Bone', look how geoset animations and decay animations look on normal wc3 models.
Also, please add a proper, talking portrait with a team coloured back ground.
You might want to make the armour look a bit more different from the normal marine model.
And if you can animate the toxin texture.