So I’ve inked the map and scanned it in:

…and I think I’m going to try and use watercolours to colour it.  I’ve not used watercolours in ages, so this may turn out to be a bad idea (test colours after the cut).

The large blue green blob at the bottom right is probably going to be the sea, with the grey-ish one in the middle being the land.

If it all goes wrong, I at least have the plain inked map on my computer as a backup.