When I saw the paintings of the Scions in the live letter, I was so excited. As soon as 6.2 dropped, I started looking for these at the housing vendors, the scrips vendors and the bicolor gemstone vendors, etc. However, it ended up that Tataru's new 6.2 quest, "Soaring Profits", is the key to unlocking the paintings.
Once the quest is done, Duremert will sell the paintings of Alphinaud, Alisaie, Y'shtola, Urianger, Thancred, Krile, G'raha Tia and Tataru for 20K gil each. He is located in the area up the stairs from the Jewel Crozier's mini aetheryte in Ishgard.
Here is the list of the names of each paintings:
Beyond Gloam's Veil - Y'shtola
Love and Loss - Thancred
Wherewith We Learn - Urianger
Business's Pleasure - Tataru
Scion of Wisdom - Alphinaud
Scion of Valor - Alisaie
Discernment - Krile
Adventure Calls - G'raha Tia
I redecorated my FC house with the paintings. Initially I was going to put Alphinaud and Alisaie's paintings only across from Louisoix's portrait, but ended up taking out the windows, which were place holders for any future portraits, and put the rest of the Scions' paintings. Of course, I had to put Thancred's painting next to Minfilia. With a small FC house, the space is limited, but I was able to put all of them in and am very happy.
Now if we could have a painting of Emet-Selch, Hythlodaeus and Venat as we have met them in Elpis, it would be perfect!
Anyway, If you want to see the FC house, The Falling Snow", please visit Plot 31, 9 Ward, Empyreum in Famfrit.