Got all the branches shaded in. So far so good as far as covering the existing tree (by the way, covering a tree tattoo with another tree, trying to match up the branches and all...is quite the challenge).
Still sorting out the options for covering the glob of lily/fairy mess underneath, but it will happen.
With a cover up of this scale, I feel it's best to have a loose idea and not get to fixated on one exact design. The existing work does really dictate the shape and color of the new tattoo, you've got to work with its flow and not try to force some new image over it.
And a reminder of how it all started...