If you spent a lot of time on it, I would say you might want to sell it. But I feel like, personally, if you post it for free, people would see that you make quality patterns and might be more willing to check out other stuff you made- kinda like a sample. Of course, it’s up to you.
I agree as well
There are quite a few penguin patterns and a lot are free. But sometimes it’s the little differences that people like. If people like your free patterns they might buy some in the future.