I've always liked these two, though I don't think they're exactly what you're looking for. They're by Boris Vallejo and Julie Bell and are from several years back. They are printed on a textured paper, and were released in two versions: a regular print and a signed (possibly numbered) version.
My preference is for the Boris one, but Julie's has the benefit of having Buffy in the actual outfit from the statue.
They're pretty (very) hard to find now, but Boris and Julie sell prints of them up to 18x24 on their website. Again, smaller than what you were looking for, but you could maybe hang both.