Hello R. First let me say, your photos are beautiful. I have shot my share of birds but bird photography is not my passion - I shoot wildlife, usually in different countries in Africa. I really like the new 70-200 G OSS lens for what I do but I also use the same 200-600 lens you have. I have an a9 for a second camera with which I shot APSC in Kenya. I am needing publishing advice. However, you can critique my work on Instagram @sdmarianne - I am happy to have feedback.