I think you need to control your wash/glaze shading a bit more too. In places, you seem to have put it on spots that are raised up, rather than the recesses. And in other places, it seems to have been put on the entire surface.
From what you have now, I would work a bit darker shade into the recesses between muscles and little crooks, then maybe an even darker shade into these spots again, just to give it plenty of definition.
The spines on his back could use a bit more work too, maybe just darken up the bits where it meets the skin on his back, to really separate the colours.
Where different colours meet (like an armour plate and skin), you shouldn't really let the actual colours meet each other anywhere, but the shades should meet. For example, a light blue surface touching a light green surface. If painted to meet each other, then they will just blend in.
But if there is a darker blue and green o the spot where the colours meet, it divides the two, and gives good definition.
Hope you can understand that... I tried.
The rest looks good though! Nice job! 8Y