Headband preview

Last night I finished the headband I want to add to the shop for next year. I patterned it after a headband my boss wore to work one day. Hers was knit and I've found a few similar on Etsy that are all knit (instead of crochet like this one). I'm debating about selling the pattern. I know nothing about copyrighting patterns. I rarely use patterns, I'm not sure that I could write one correctly. I just looked at the knit headbands and crocheted the general shape the same as the knit ones. (It took me three tries of undoing the yarn but I like how it turned out!) I added the flower and sewed on a button for easy and adjustable closure. Any advice on pattern writing/selling?