Pino's Melodica from Ergo Proxy

I loved watching the anime called Ergo Proxy and recently i decided to make in 3D the melodica of Pino, one of the characters.
It was also a test for look how the render in Unreal Engine 4 is, and the result is looking pretty good in my mind.
If you have any tips or critics, i'll appreciate to know about it. ^^