Ever thought that by posting images, you are also not considered anonymous on the web? At least your IP, Mac address, browser, and everything related to your system fingerprint is easy to identify. This is equivalent to using bitcoin; you need to put in some effort in the same way.

And if you are so worried about your "non-anonymous" transactions, then think about this one more. The best advice I can give you is not to go online at all. This way, you will remain anonymous.