Atrahasis is right, also, I saw the pics of the new nacelles, and the top of the magnatomic amplification crystal is way too pointed, it should taper to a rounded edge. you may want to drop that one vertice down so it is even with the rest and chamfer the edge. it would help immensly.
Also, those big rectangualr panels on your saucer are suppose to be the same color as the rest of the saucer maybe alittle darker, just the outline is suppose to be the same basic color as the hull grid lines, they arent suppose to be that light inside. If you need refference, you may want to check my Connie tread.
Also, is this suppose to be a smaller ship? I only ask because in the TMP era they used all the same nacelles on ships of the same size class, that leads me to believe that this would be the same way, if so, then your windows are too small on the majority of the ship. your bridge windows are alot bigger than the rest of them. If it is a smaller ship, then your windows on the entire ship would need to be bigger to reflect the size difference. and the blue part on the impulse modual needs to have a rim on the top with struts going to the bottom on it, if you need refference pics of that, I'd be happy to provide them.