CAS Background: https://katverse.com/category/custom-content/cas-background/
 
Elena
Body replacements: http://luumiasims.com/post/152404590469/body-redux3-new-body-replacements-to-improve-your
Skin: http://pyxiidis.tumblr.com/post/129428280796/summer-skeletons-v2-a-skin-by-pyxis-hi
Skintone: https://www.thesimsresource.com/downloads/details/category/sims4-skintones/title/skintone-set-v2/id/1313399/
Face shading blusher: http://blog.naver.com/kero7423/220166799107
3D Eyelashes: http://kijiko-catfood.com/category/the-sims4/ts4-makeup/
Defined nose: http://sims4nexus.com/?p=4813
Face contour: https://www.thesimsresource.com/downloads/details/category/sims4-makeup-female-skindetails/title/contour-n01/id/1316851/
Hair: https://aveirasims.tumblr.com/post/149953872776/jakea-eternity-retexture-70-colors-20-ombres
Baby hair: http://candycanesugary.tumblr.com/post/152214968875/baby-hair-serena-hope-you-guys-enjoy-the-new
Eyebrows: http://www.thesimsresource.com/downloads/details/category/sims4-hair-facial/title/yuri-eyebrows-n41/id/1315767/
Eyes: https://s4models.com/2015/01/21/all-my-posts-on-tumblr-got-deleted/ (called Super eyes)
Cleavage detail: http://js-sims.blogspot.com.ee/2015/02/js-sims-4-cleavage-detail-overlay.html
Lips: http://pictureamoebae.tumblr.com/post/147259113679/real-lips-revisited-release
Blush: https://www.thesimsresource.com/downloads/details/category/sims4-makeup-female-blush/title/imf-miss-blush-n.17/id/1363426/
Eyeliner: http://www.thesimsresource.com/downloads/details/category/sims4-makeup-female-eyeliner/title/subtle-cat-liners-n29/id/1333108/
Eyeshadow: http://www.thesimsresource.com/downloads/details/category/sims4-makeup-female-eyeshadow/title/%5B-whisper-%5D–light-eyeshadow/id/1301603/
Nails: https://www.thesimsresource.com/downloads/details/category/sims4-accessories-female-rings/title/nails-02/id/1296207/
Necklace: http://tukete.blogspot.com/2017/01/vintage-glamour-necklace-edit.html
Shoes: https://s4-cc-shoes.tumblr.com/post/163855731598/puresims-pixicats-acne-clover-boots-3t4
Dress: http://www.thesimsresource.com/downloads/details/category/sims4-clothing-female-teenadultelder-everyday/title/s4-jada-dress/id/1334620/
Jacket: http://love4sims4.tumblr.com/post/150931757553/elliesimple-elliesimple-denim-jacket

Katherine
Hair: https://simfileshare.net/download/98586/
Baby hair: http://candycanesugary.tumblr.com/post/151192203125/baby-hair-eve-3-to-4-conversion-21-swatches
Nails: http://www.thesimsresource.com/downloads/details/category/sims4-accessories-female-rings/title/matte-square-nails-n07/id/1338599/
Eyeshadow: http://www.thesimsresource.com/downloads/details/category/sims4-makeup-female-eyeshadow/title/cat-eyeshadow-n41/id/1358372/
Eyeliner: http://www.thesimsresource.com/downloads/details/category/sims4-makeup-female-eyeliner/title/simple-eyeliner-n42/id/1344175/
Lips: https://www.thesimsresource.com/downloads/details/category/sims4-makeup-female-lipstick/title/%5B-bon-bon-%5D–candy-lip-colour/id/1352498/
Blush: https://www.thesimsresource.com/downloads/details/category/sims4-makeup-female-blush/title/sweet-cake-blusher-n01/id/1293989/
Necklace: not available anymore
Bracelet: http://www.mia8sims.ru/news/ts4_bracelet_1_by_mia8/2016-08-28-175
Jacket: http://www.lumy-sims.com/2016/11/leather-jacket-accessory.html
Corset: http://www.thesimsresource.com/downloads/details/category/sims4-clothing-female-teenadultelder-everyday/title/imf-corset-top-victoria/id/1360269/
Shoes: http://www.thesimsresource.com/downloads/details/category/sims4-shoes-female-teenadultelder/title/madlen-nosferatu-shoes/id/1293845/
Jeans(updated): https://simpliciaty.blogspot.com/2017/02/skinny-ripped-black-jeans-updated.html