Why am I seeing the same marionette lines as before full facelift 3 weeks later?

The marionette area may not be helped by a facelift. Often when you see people that look too tight it is because they went after this area with a lateral pull and ended up making the person look as if they were in a wind tunnel. An excision in this area if it is due to extra skin or possibly a filler can help. If it is due to lines around the lips you will need resurfacing by either laser or peel. For the really deep lines, filler can help as well.
Be sure to discuss with your surgeon how this area can be improved.

You may still notice some improvement after the swelling subsides, however wrinkles and folds may not be corrected from a Facelift alone. This is especially so with any perioral wrinkles including the marionette lines. If not resolved from a facelift and fat grafting, you may need to consider additional procedures such as fillers or a marionette line incision that can be done under local anesthesia.

These lines may not completely resolve with a facelift although they should be significantly better, specially with fat grafting in the area.  If these are very fine lines, a perioral peel can help.