Pretty sharp and nice use of limited colors. The pixel placement is very specific and thought-out, nice. The infection version works for me best, but at a close zoom it seems you've oversharpened with black in places, almost creating the effect of an Unsharp Mask filter, which is okay if you want it like that, just mentioning it as an impression. Personally so so so much focus isn't something I'd attempt, but it's a nice thing to see it being done by mindful pixellers.