I'm at about four and a half months now. I would post a photo but I have found it really difficult to get a photo of my scar. You need to get really precise focus, and it's hard to highlight what you're trying to show.
To summarize, though, my hairline scar is visible if you scrutinize it when I pull my hair back. It's worse on the side opposite my part, which means that the best side is the part people can see — and there's really nothing to see. There's no weird scar tissue, just the kind of thin skin that grows back when you're healing — and it's nice and smoothly continuous with the rest of my skin. The only thing there is to notice i that it's a bit pinkish in certain light and still smoother and more delicate, and the underlying tissue is still a bit bumpy, though not the skin itself.
But the scar isn't even the main effect that people might notice. The main problem is that hair near the scar got cut, so I have little short hairs like mini-bangs (but really scraggly) that look weird if I pull my hair back, so I don't.