I used the Leah portrait from SVO as a temaplate but it still looks like Leah. How can I make it more uniqe? and before you say I didn't added anything I did changed many things!
The hairclip is nice. The scar is so dark though. Maybe consider slightly altering the jaw shape? That's likely what making the portrait look similar to Leah's.
One thing to try is go through the earlier artwork for all the dateable women (OK and Elliot) in the wiki and look at the previous versions. CA went through a lot of different ideas before settling on the current ones and some of them are great, including earlier ones of Maru and Abigail. One might give you good inspiration. Or a new jawline, as ISSsloth suggested.