This is a Reaper Carnosaurus, which I think also looks like a Megaraptor. The base is large (40mm). I think the colours are accurate to what Carnosaurus would have looked like.
This is the beast I painted for my Necromunda Chaos Cult. I used wet-blending so that his colours change over his foul form. The metal spikes that protrude from him always corrode, no matter what the gang does to try to sharpen them. So his name is Rusty.