Re hanging loosely: remember that I did NOTHING to this hair dynamically or styling-wise. I just planted it on the head in roughly the right place and added my materials.

Re shimmer and depth. Meh. I suspect you're not really after realism, but faux glamour shots. Real hair is not that shiny except in lighting that is nothing light what is present in the setting of the render. At any rate, I deliberately keep my specular highlights relatively low and my materials relatively desaturated. Most real hair just is not as saturated and bright as artists like to make it. Were I going for the faux glamour look, of course, I wouldn't worry about that. :)

Either way, increasing specular and saturating the colours more are minor things to accomplish in the material settings.

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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