Hello!
The mandatory disclaimer first - it's your model, if you hapened to like her in pink plastic, we're all happy for you!
After joining the halves, is it still smooth and glossy? How about the parts joint - wouldn't it benefit from some filling and sanding?
I, for myself, find the best plastic not looking too good - to translucent for me, so for white models I prime them and paint them white. I've had particularily good results with a layer of grey Tamiya primer followed with a coat of white Tamiya primer - gives a nice white surface in just two passes, this can be hard to beat - because if you paint a spotty surface white, those spots tend to show through, even through several layers of white. So I paint the grey layer to make everything nice and uniform, and then good white on top of that finishes the job.
As for the other colours - you need a process called "research" - I bet there are many photos on the net, taken onboar the AIDA ships - those should show the railings and other like objects very clearly. For example this one should help you out nicely:
Just be careful not to get an appetite to model everything exactly like it is on the photo - that would be "superdetailing" - might cost you a big part of your life! :-)
Good luck with your build and have a nice day
Paweł