I am sorry, but that is a bit rude. It's not really nice going around on other profiles writing a comment in which you order them to watch you back.
Yes, I know, but watchers should be earned, not forced. And asking - or even pretending - that people should follow you back will earn you fake followers who don't care about your work at best, and people who don't even want to view your account let alone support it at worst.
Plus, as I said, it is quite rude to do so. A lot of people don't like it.