I don't think there is any way of assigning certain portraits to family members as discussed in few other threads on this forum.
https://forums.totalwar.org/vb/showthread.php?t=51549
There is a way around it if you extract PAK files.You would need to start campaign and see what portrait has been assigned to your character.Take a screeshot of family tree or even better page with general's traits.Go to UI and find folders containing pictures of your generals.Here is where a tricky part starts: finding correct generals tga file- this is where your screenshoot taken earlier comes handy.If I remeber right there a least 100+ images to go through and some look very similar.All tga files have their numbers -in order to have different picture for your general you need to change the number, so your image has got the same number as portrait seen in campaign.I had my Seleucid character pictured as Eastern Diplomat,choice is yours.And finally you need to delete ui_0.pak file or new picture would not appear.
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