Looks good. For those fins on the back you could redo the top and bottom ones to be identical to the middle ones and dock all six to turret joints. this way they'll look the same and you can position them at any angle you like which will look a lot more like the picture you based the ship off of. you could fill the interior of the fins with thrusters which the main ship can inherit making them useful system wise even if they're just decorative pseudo turrets. I'd also use slabs to make those three blue light bars on the sides slimmer to match the pic you posted.
