Unfortunately, I don't really know. I'm more of a general touhou kind of guy rather than cirno in specific, but I've taken her up as a main icon cause' she's the easiest to recognize. My advice is to use more Cirno reaction images, and more people will think it's okay to use cirnos.
Also, getting the fishe and flag threads to stop dying all the time. A whole lot of them were wiped out when the fishe stopped lasting longer than a day.