Thanks guys for your feedback! This is really helpful for deciding what to do next, knowing how round 1 turned out.
In terms of the hairline placement, I am happy with the design and placement but now that it's there I sometimes wonder how it'd look if it was a smidge lower at the sides. I kinda doubt I'll change it on the second pass, though, and don't want to fall victim to hair greed. You are right, I am not too worried about the double(s) up there, but I have a few rogue hairs way below my hairline that bother me a bit more. I hope to get rid of those during round 2 if possible.
In terms of the hairline density, I feel it is good when feathered over / styled down, but is still see-through when styled up, blown over, wet, or with short hair. Ideally I'd get some extra density up there (the hairline was planted at ~30 grafts/cm^2) but it is good to know that it looks like it mostly grew.
I do really wonder about the frontal third though in terms of how much growth I got, and whether some of the thin hairs I have there now are grafts that will thicken up or natives that will not. My doctor said it was less densely packed than the hairline but the difference aesthetically is pretty stark so I'm wondering whether I got good yield up there or not.