Yet another fabulous update on your ongoing adventure! Sounds like a wonderful relaxing holiday. She seems much more at ease in the photos and with sending ever more revealing ones to your friend. Even when you send without approval her initial reaction seemed muted, and quickly turned to arousal knowing your friend has seen even more of her sexy bod. Especially with his compliments about how sexy and hot he thought she looked, or was that how hot her snowman looked...
You have a great "tactic" to build her confidence with both of you complimenting her, and you telling her how much you enjoy sharing her beauty with others.
Other than topless on the beach, did she go out in revealing clothes? Wearing something like that sheer black top in the last photo without anything else on top? Or that little white top and red mini skirt? Even just for a walk around the block where you were staying... Did she go braless as you hoped? Let others see up her short skirts, not just on your balcony... If not, maybe you can encourage her to go for more walks at home this summer while the weather is warm along the canal, in the woods / park, and to a pub for a beer / wine or 3 or 5... Would be fun and exciting for you both - and all who are lucky enough to see her!