From the Aulendorf wedding link that @izabela84 provided, here's the page where you can find one photo of Princess Angela and Prince Max dressed beautifully as always walking toward the church most likely. Angela looks so lovely in a deep pink/ magenta dress. She always looks self-contained and elegant.
scroll to middle of the page (pic of Max & Angela is far right, middle)
I also found this delightful Q&A with Princess Angela re travel tips when visiting Panama. Angela describes Panama so lovingly:
Panama Guide | World Of Aerin
Here's an excerpt from the above Q&A with Princess Angela, in her own words:
"My favorite escape is to the AMA Estancia in the charming town of Pedasi, on the southern tip of the Azuero Peninsula. The AMA is a gorgeous secluded retreat on a private beach. The terrain is really green and unspoiled. We go for beautiful walks on the beach. My husband and son love to surf, snorkel or go fishing in the early morning. In the afternoon they either play tennis or go horseback riding in the hills. The best time to visit Panama is from December through April to escape our grumpy winters and then again July and August when the whales migrate and we can see them from our breakfast table at AMA Estancia."
From the other link to pictures of the extended Liechtenstein family with the Pope, I found additional links to public event info chiefly for Prince Max, and a couple of appearances by Princess Angela (including the earlier posted Sothebys picture in Munich). The travel tip Q&A (World of Aerin) link is from this event page:
Luxarazzi: Prince Max
And here's an article about the extended Liechtenstein family's visit to see the Pope:
Luxarazzi: Princely Family Meets the Pope
The main page linked earlier by izabel84 shows Prince Alfons greeting the Pope:
Luxarazzi: Tons of Pictures of the Liechtensteins at the Vatican
And here is the gallery of photos of the Liechtenstein family's visit to see the Pope. Scroll down to find Princess Angela shaking the Pope's hand -- her face is obscured by her hair, but it's photo #00024 on the first page of the photo gallery. Prince Max and Prince Alfons additional individual photos must be on other pages in the gallery. Yes check page 3, photos 00100, 00101, 00102, and 00103 for pictures of Prince Max, Princess Angela and Prince Alfons with the Pope:
LE LORO ALTEZZE SERENISSIME I PRINCIPI HANS-ADAM II E MARIE DEL LIECHTENSTEIN