Your shading on the orange and reds is great, keep that up! But the gold horns are flat and that purple tounge detracts from the overall hot orange feel of the great beast (IMHO). A close pic would have helped as well, still very nice, large models like this are harder than they look.
The orange is nicely shaded and highlighted, but you need a bit more contrast with the base, maybe a dark green. Also, the gold on the horns and claws is such a major feature that it should be given more shading and highlighting. A wash of brown ink maybe.