Nice to see the CA-2D in our scale.
I agree w erik on some of the points above - rigging needs to be revisited especially. USN ships of this period typically have three different types of rigging that's visible in drawings: halyards for running signal flags/ensigns, stay lines for anchoring pole masts, and antenna wiring strung between the masts. Make sure you know what every line of rigging you are drawing is supposed to be. Look at my drawings of similar ships for examples.
The pole masts are also too thin to support the kind of weight of these radars. I see on the "battleship mast" version you've taken the upper part of the foremast from Alaska, which is fine, but its support below is questionable at best. The pole masts should be 4px wide (1 black 2 grey 1 black).
Are the windows on the open bridge meant to be an enclosed pilot house with glazing, or are they plexiglas windscreens? If they're windscreens they are too large - and if you're trying to show an Iowa-style enclosed pilot house, there should be roof structure visible above it.
The bow shading should (IMO) be more a smoother curve and the colors seem too dark (but nice job on this either way)
The rudder should be squared off and not rounded as you have shown. These strange round rudders that seem to have infected recent SB artists are baffling to me...
Erik is right that the surface lookout viewing slits on the tower seem wrong - I'd look at the placement of these on the alaska drawing to ensure they make sense: http://www.shipbucket.com/drawings/1/file
BTW, it looks like you've cut and pasted components from my old Alaska drawing vs. the new one which is much more detailed.