Well, if you look at different pictures from NASA, the colors are different from one to another. Colors and light doesn'T reflects the same in space, there is less pollutant and there is also a big contrast between the deep black space and a sun lighted area of the space station so cameras has a tendency to try to correct the contrasts and will fade the colors a bit. Like the solar panels, they look different depending on what they reflects wether its the ocean (deep blue) or sun light (reflects of gold). So paint it the way you feel since the only way to verify your choice is to go there.
For the white spots with black dots and yellow markings, I simply made them on a thin sticker sheet and applied them all along the modules. The main problem is to place them corrctly. There is so many of them and not enough pictures to locate them all so you'll have to improvise. DO NOT expect to have an accurate version of the ISS since it's unfeasible because of the lack of info from NASA and lack of detail from the kit itself. If you want a good start, take a look at a paper model of the ISS available fof free download and (marscenter.it) or something like that I'll have to verify. You can use the flatten images of each module and print some part of them on decal paper to simulate some details.
Go there: http://www.marscenter.it/eng/default.asp
Click on Topics and then on Modeling and downlad the complete actual configuration of the ISS (not the final assembly)
No matter where you go ....... there you are.