Instead of looking for a good pale perfect texture consider looking for the things that you want to see in the final render like the faint tracing of veins, https://www.daz3d.com/add-some-veins-hd-for-genesis-9, https://www.daz3d.com/add-some-veins-hd-for-genesis-8, https://www.renderosity.com/marketplace/products/117529/lie-eye-veins-and-bleeds-for-genesis-3-female, https://www.renderosity.com/marketplace/products/148631/twizted-skin-details-for-genesis-81, https://www.renderosity.com/marketplace/products/119145/twizted-anatomical-details-skin-mr, https://www.renderosity.com/marketplace/products/125214/freckled-skin-g8-mr, https://www.renderosity.com/marketplace/products/162188/freckled-skin-mr-for-genesis-9, https://www.renderosity.com/marketplace/products/114308/skintastic-skin-mr-freckles-g3f, https://www.daz3d.com/skin-detailer-for-genesis-9-merchant-resource, look for moles, pimples, blemishes, etc. You can also use Photoshop brushes to help you achieve the effects you want.