It's a good first build. A couple of points
Bearing in mind, "It's your kit, build it how you want:"
-Bridge windows: if they are large, rectangular windows will look better if you blacken them. However, the round portholes had metal covers that were painted the same color as the camouflage around them so leaving them unblackened would be closer to appearance to an unopened porthole.
-Some of your 20mms are the lighter gray color; generally they were painted to match the camouflage of the buklhead inboard of them, so if the bulkhead was Navy blue, so were the shields and pedastals, and if it was Ocean Gray, so were the shields and pedastals.
- Not all deck edges had railings. Some areas around the twin 5" mounts did not so that the turretcould turn and because they turret would theoretically block someone from getting near the edge in that area. This is one of those "check your references" types of details as it varied.
- Camouflage measures called for all horizontal surfaces to be a specific color. On yours it look slike you have the wood decks in blue, and left the metal decks up higher in gray. In actuality they would be painted deck blue as well.
Still, very well done for a first effort!