Not sure if these fit the definition of Hi-res units... as a lot of original artwork went into this. It has definitely not been as easy as rescaling and fiddling just a little bit... But a lot is based on other image sources and models, and the work of others, from converting 'blobs' into something that makes sense, to ripping an african shield where needed
Naval units :
1st line, medieval ship types : knarr, cog, another cog, hulk, galley
2nd line, late medieval/early modern ships : carrack, caravel, another caravel, great carrack/nau, war galleon
3rd line, modern ships : corvette, 2 nearly identical 3-masted frigates, troop transport, small whaleboat/gunship
African units :
1st line : zanzibari workers, pioneers, shooters, porters carrying supplies, ammunition and ivory, and slaves/pathfinders
2nd line : manyuema warriors, archers, chief, pygmies, cannibals, steppe warriors, and ruga-ruga (raiders)
3rd line : H.M.Stanley, european officer, Emin Pasha, native garrison, interpreter, egyptian officer, and missionary