Great work here Fluisterwoud!
I specially like the texture work on bull's skin (not quite sure on the blueish tint though), the skin of it's raider looks also excellent to me, and I like very much that NMM gold, specially the shield which has become super shiny.
I pretty much like all of those Arena Rex miniatures, but they kind of intimidate me a little, which was a perfect excuse to not buy them and keep trying to reduce the grey pile monster. ^^