If you want feedback, I feel like the breasts layer could use less red and maybe boosting the blue / green balance very slightly, also moving it slightly lower on her torso would help.
For placement, what I think helps a lot is to draw guide lines on a new layer on top, like where the clavicle, breasts, etc would be on the original image, and when pasting stuff, I make sure to fit into those lines as best I can.
Nice idea and good effort though!
Great advice from the faker master, I'm sure you can make the fake better with his advice... On side note, great try for your first post (and maybe first fake?). Keep growing your skill.
Also Lisa are always hot, even the orginal pic before the fake are so fap-able