I would extend the fire control tower rearwards and maybe even combine it with funnel no.1. You can move the external pipes to a p&s configuration on that funnel if you do that.
That would give Spot One the ability to rotate 360 degrees, which is something I've seen quite a few photos of on USN cruisers. For whatever reason they seemed to like rotating the directors so the front faced aft. Believe it had something to do with protecting the delicate ranging radar antennas and rangefinder optics.
I would extend the size of the bilge keel horizontally, make it at least as long as the bottom section of the armor belt.
As this is the 1928 version I would delete the aftmost Pom-Pom from the fantail. IIRC that position was only given AA once the need for it had arisen. I would be surprised to see machine cannon at all on a cruiser built this early.
You might experiment with adding another deck level amidships. You could try raising the funnels to sit atop it or just leaving them where they are, doesn't really matter. This deck level would provide boat storage while also giving you the capability to install a secondary battery of open mount 5" guns (like Brooklyn or New Orleans) amidships at the 00 level.
Personally I am not a fan of the rounded underwater section of the bow heading aft to the keel. I think it looks strange for whatever reason. I prefer the squared-off USN type, but it's really an aesthetic choice. This is what I would do: also added some bow details that weren't there, like jackstaff with anchor light, bow chock, and anchor chain hawsehole.
I think it gives the ship a more warlike appearance for whatever reason. Again, your choice.