Heheh, You did alright!

Napther isnt normally that big unless he is in Kaiju form - Which is all glowy and covered in plates. A Little too much detail beyond the original :P
Probably the only detail you have missed is that on his Armour plates, the Stripe is a darker brown, but otherwise not bad for one as complex as Napther!

If you need any help anatomy and colouring/shading wise, Im here to help.

Thanks :3

x3