I would suggest to put some distinctive elements to the secondary hull texturing, look at the Sovereign, it should be quite good inspiration ;)
I would add some service hatches, line red running throught the "spine" with SFC pennents at both ends, some transporter emitters, core dump hatch, sensor paletts (Intrepid style but try to change it a bit to make it more unique).
You could also add those red warning marks around critical areas of the ship like phaser stripes, deflector dish, service hatches etc.