Since there was not much space left for adding anything to the wolf any more, I had to stop there. And then I realised what was bothering me most, the lack of quilt bumps. Because there is no wadding, there couldn’t be any quilt bumps which made whole thing so flat.
Option 1, remove stiff backing fabric and piece other fabrics to make it bigger and quilt around the wolf.
Option 2, insert a cut out piece of wadding in between two layer of fabric and quilt it.
Both looked like a tedious work so I chose option 2 thinking may be easier to remove those wrinkles.