The new Antarctic Map is scientifically accurate so you could use that one. Don't know though if the Snow still melts sometimes. If it's completely accurate it should at least happen at the Coast during "Summer".
I wonder if they don't encounter any Trees in their Natural Habitat at all or just not many
Edit: googled it. They also encounter Trees in their Natural Habitat, so the Pictures are absolutely great

I think I might also do the ones for the King Penguin because I want to rebuild my antarctic Research Center again anyways now that we have a scientifically accurate Map