Hi Sabine-
Your pictures are beautiful!
One thing I don't see that you mentioned is being active with treasuries. I found I spurred some activity for myself when I started making them and sharing them on my Facebook and Twitter. Also, when I make a treasury, the person who has that item is alerted, but I still send them a message letting them know I liked their product and featured it.
By doing this, you become a little more active with other Etsy users and will hopefully be featured in treasuries down the line. People love to feature items with great photos, that which you do have. I typically notice sales shortly after I've been featured, which is really nice to see - and I always go back and thank that person who made the treasury. :)
Good luck!