The overall design is pretty good. It's too block-y for my liking, and with regards to the textures, I think that you should do something closer to the Connie refit for the the aztec styling. The aztencs on the outside of the ship look fine, inside of the phaser strip, they look too small for a ship this size.
This clearly isn't a big ship, if that cylinder on the dome is the turbo lift as I suspect, then there are too many decks on that superstructure. Or maybe it's a really huge lift.