I can't un-see the panda in the picture. looks a lot more friendly than the arth fawr ddu!
And that "arth fawr ddu" makes me go "hmmm". In English you could never say "A black big bear", but in Welsh, an arth ddu fawr is a black bear that is big, but an arth fawr ddu is a big bear that is black. In other words, I think that your description is more correct than mine. How interesting... (sorry - to me, that is!)