Another option for younger girls is to use the Stephanie morph set, which is more petite and includes additional morphs that look useful for creating a youthful character. I haven't gone all-out to see how far that can go, though.

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3