Morning Bob
If the photo is the only historical reference that you can find then you would have to use that as your blueprint for the accuracy of the camouflage scheme. as for the shades of colours go back to the ship camouflage web sites and research the royal naval paint schemes of WW2, anything else is purely subjective and dependant upon any critic having a better historical database.
I am sure that an archivist somewhere will have more accurate information and will probably pop up when you have finished the model and say that your camouflage scheme is 2 microns out or that the deck should be painted a delicate shade of pink, these are things that you don’t know and as such encapsulates the dilemma that faces all historical model builders.
In other words your dammed if you do and dammed if you dont
Over to you captain
Paul