We can now try to get the colors and fills right. The atlas is a century old, and the paper is a little yellowed; at the same time, the inks aren't the deepest black. In addition, the fills (blue sea, pink land) have to be added.
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Finally, we add the rest: the sea routes and labels.
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Compare to the original map:
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The colors are a little off; it looks like the inks have faded (or were never too dark to begin with). The font doesn't quite match (I used New Century Schoolbook, which is a good but not perfect match to Edwardian and late Victorian map typefaces). But even beside these two things, there's still something missing; a certain fuzziness, perhaps?