I think this will be moved to The Sims section 😉
It's really tough to edit kids in Sims 3, Oachi. Your sim of Regan is looking too chubby 😉 , you should download extra sliders to achieve the look you're looking for. It requires a lot of practice in CAS (Create a Sim) to be able to produce great results.
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This was the best I could do so far with my Sims 3 versions of Shirley & Sachi:
The picture on the left is Sachi version in-game and on the right is a clone edit of Sachi's eyes/mouth. I need to find an upper lip slider for kids in order to make her mouth look like Sachi's.

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Oh my.. Nicoletta looks possessed in that picture lol. What is that purple thing you put on her face?