Being Polish myself, all I can tell that Microsoft screwed lots of things doing this job, but replacing a face in question might not be one of them. Here in Poland, racial diversity is not as strong as in civilized areas of the world. Actually, there is none. All we got here are Commies, which come in red, of course. And there is only a few of them left. No Afro-Europeans. No Asians. Seeing person of another colour of skin is still somewhat unusual, and, IMO, no wonder that someone at MS decided, that original image does not picture its target in this specific geographical region. Still, you could ask if it really matters. Or why they did not remove Asian guy. Or why there are no polar bears outside. Or why this image is photoshopped in so disturbing way.
Just as a side note: some people might consider this as a racism, but I believe that it's not that. Polish people are just not familiar with variety of cultures, because there is really few people of exotic descent here in Poland. Seriously, just tell me by yourself: woud YOU like to come here? Yeah, I thought so. OTOH we think all your political correctnes, with all this avoiding colours, feminoamericans, "Baa baa black sheep" being banned from nurseries is really exaggerated. But still, I haven't been there.
PS. As I mentioned before, English is not my native language. All spelling and grammar errors you found, you can keep them for yourself.