Oh Boy !
The Titanic is just a large group of sub-assemblies . Take all the parts indicated to be white and even if molded in white , Paint them . Otherwise they'll never look right .
Carefully dry brush all the windows in a light mahogany brown . Testors Square bottle dark Brown is good for this , just add one or two drops of white to tone down the darkness , otherwise the brown will look black in that scale , then assemble them .
Do this throughout and you will be pleased with the result . The hull should be painted Semi Gloss black with a few drops of Semi - Gloss White in it .
The reason ? Simply , Scale effect . If you paint it Flat or Gloss Black it will actually look smaller because of all the darkness the Large Black hull creates . Plus it will show better against the Semi-Gloss white areas .
There are some areas that are on the Hull upper edge that should be White .Paint them Light aircraft grey for a primer and the Semi-Gloss White will show up fine and proper .
When you get to the Red below the waterline . British crimson semi-Gloss is appropriate . Just make sure you don't paint the props Copper or Bronze or Gold . Take a few large drops ( eight ) of Gold in a medicine bottle cap . Add one large drop of Copper and two large drops of Bronze metallic or even Aluminum . Mix well and paint with an almost dry brush in swirls . That will approximate the polished metallic finish they had before they got wet !
I hope this helps . Tanker - Builder P.S.The decks should be a very light Deck Tan . Humbrol makes a good tin of this , the stacks should be a very dark yellowish tan . Almost stained Dark Oak color . Mix four large drops of Deck Tan Testors and one drop of Light Yellow . Don't forget to paint all the rail tops and bridge wings the Brown on the top edge ! . Good Luck .