This is why you NEVER draw a stencil from a picture of an existing tattoo, even if the client "wants the exact same thing" - the image will be distorted.

The tattoo ref:

If they are determined to replicate the design (or in this case, I am reworking it to correction), you need to look for the original reference image used; using the TATTOO reference image is not good enough, not only because of distortions but also the artist that did the tattoo might have made some choices (changes/simplifications) that you would not. A lot of the widely-circulated images of existing tattoos that folks bring in are decent, but sourced from exactly one original picture that you can track down with a little work. With AI junk clogging things up, it took me a bit longer than it should have, but I did eventually find it:

FIRST - This is not my work.

In my professional opinion, this is... not good.

If you plan to cover heavy black with more black, you need to do something with contrast so you can read the edges of things, otherwise any detail is going to blend together once healed - this is going to look just like the old tattoo, but more obscured and with a bird head on top... an unreadable mess.

Starting to fill this arm with more nature stuff!