Hello Mirko! Welcome to my group and thank you for joining! I think you did really great with your images. The first image and the last image stand out the most to me. The first one is beautiful as it seems the branches seem to reach out to the sky and the last image is very beautiful as there is a wonderful mood with the image. Yes, you are right.. without sun... about nearly impossible to get a good image. I live in Florida... AKA.. "The Sunshine State" so I am pretty lucky in that regard. You will have fun experimenting with different filters and get different results each time you go out. My best tip for you is to keep the sun at your back. You always want to have your subject with the most light possible lighting it up. I look forward to seeing more of your work. Thank you for sharing!