Violence towards zombies isn't really NSFW lol unless it has a lot of blood and gore, which I'm assuming it will considering well IT'S ZOMBIES RAWR
seriously through bro, you seem really indecisive with the whole NSFW thing. Here's the deal: if it has naked bodies (and I mean naked bodies - boobs, butts, the whole shebang), then make it NSFW. If it has super vulgar language with F-bombs dropped every 5 minutes, mark it NSFW. If it has suggestive content like a sex scene (which ties in with the nudity, although I'm pretty sure Tapastic has a stance against nude sex scenes regardless of the NSFW filter because that's pornography lol) or serious drug/alcohol abuse, it's NSFW.
If it's something you wouldn't be caught dead reading in the office or in front of your mom or grandma, it's NFSW. I really can't lay it out any simpler than that lol And honestly bro, from what I've checked, you're only 2 episodes into your comic, so unless you're working on the next set of strips and are getting worried about it being NSFW, I don't think you have anything to worry about so far (and I've checked your comic; it looks like something from Soul Eater or a Japanese anime in terms of art and story style, which is totally fine lol but it just supports my point that your comic isn't really NSFW).
But don't forget one crucial fact - you can mark -individual episodes- as NSFW. My gag strip has one NSFW comic so far just because it has a bit of, er, alcohol abuse lol and while that may not be bad enough to be considered NSFW, I marked it anyway just in case cause I know some people are sensitive to that stuff and I want to be respectful. So if you decide to mark your comic as NSFW, that doesn't mean it has to be NSFW all the way through - if one strip is particularly cheery and fine and has nothing wrong with it, leave it without the warning. No point in warning someone about NSFW content if there's nothing in it that's NSFW. And if there's another episode that DOES have suggestive content like nudity or serious blood/gore, etc. mark it as NSFW. And of course, if there's a comic that SHOULD have been marked NSFW, I'm sure your readers or Tapastic's friendly staff members will let you know. Then you can just mark it NSFW if anyone has a legit complaint about nudity or whatever. No harm no foul.
Simple as that.
