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Southern Europeans would all look Irish/Welsh Brunns/Aurignacian Atlantids instead of what they look like now, Scandinavians may've become 80%+ blonde rather than the 30-35% it is right now(blonde hair was most prevelant among Scandinavian and Baltic HGs but still a minority, however we know Scandinavia was the place with the most massive selection for blondism, without all the foreign genes it may've been much more).
N Europeans would also have a lot lighter skin(EHGs/steppe people darkened Europe, not lightened) like pale British islanders and wouldn't have the ability to tan, freckles would also be a lot more common. Depending on whether civilization and urbanism managed to spread from higher population areas in the Middle-East without gene flow, Chinese probably wouldn't outscore Europeans in math like they do now.
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